linux-block.git
4 years agoMerge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa...
Linus Torvalds [Sun, 21 Jun 2020 02:18:27 +0000 (19:18 -0700)]
Merge branch 'i2c/for-current' of git://git./linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:

 - a small collection of remaining API conversion patches (all acked)
   which allow to finally remove the deprecated API

 - some documentation fixes and a MAINTAINERS addition

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  MAINTAINERS: Add robert and myself as qcom i2c cci maintainers
  i2c: smbus: Fix spelling mistake in the comments
  Documentation/i2c: SMBus start signal is S not A
  i2c: remove deprecated i2c_new_device API
  Documentation: media: convert to use i2c_new_client_device()
  video: backlight: tosa_lcd: convert to use i2c_new_client_device()
  x86/platform/intel-mid: convert to use i2c_new_client_device()
  drm: encoder_slave: use new I2C API
  drm: encoder_slave: fix refcouting error for modules

4 years agoMerge tag 'trace-v5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
Linus Torvalds [Sat, 20 Jun 2020 20:17:47 +0000 (13:17 -0700)]
Merge tag 'trace-v5.8-rc1' of git://git./linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:

 - Have recordmcount work with > 64K sections (to support LTO)

 - kprobe RCU fixes

 - Correct a kprobe critical section with missing mutex

 - Remove redundant arch_disarm_kprobe() call

 - Fix lockup when kretprobe triggers within kprobe_flush_task()

 - Fix memory leak in fetch_op_data operations

 - Fix sleep in atomic in ftrace trace array sample code

 - Free up memory on failure in sample trace array code

 - Fix incorrect reporting of function_graph fields in format file

 - Fix quote within quote parsing in bootconfig

 - Fix return value of bootconfig tool

 - Add testcases for bootconfig tool

 - Fix maybe uninitialized warning in ftrace pid file code

 - Remove unused variable in tracing_iter_reset()

 - Fix some typos

* tag 'trace-v5.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Fix maybe-uninitialized compiler warning
  tools/bootconfig: Add testcase for show-command and quotes test
  tools/bootconfig: Fix to return 0 if succeeded to show the bootconfig
  tools/bootconfig: Fix to use correct quotes for value
  proc/bootconfig: Fix to use correct quotes for value
  tracing: Remove unused event variable in tracing_iter_reset
  tracing/probe: Fix memleak in fetch_op_data operations
  trace: Fix typo in allocate_ftrace_ops()'s comment
  tracing: Make ftrace packed events have align of 1
  sample-trace-array: Remove trace_array 'sample-instance'
  sample-trace-array: Fix sleeping function called from invalid context
  kretprobe: Prevent triggering kretprobe from within kprobe_flush_task
  kprobes: Remove redundant arch_disarm_kprobe() call
  kprobes: Fix to protect kick_kprobe_optimizer() by kprobe_mutex
  kprobes: Use non RCU traversal APIs on kprobe_tables if possible
  kprobes: Suppress the suspicious RCU warning on kprobes
  recordmcount: support >64k sections

4 years agoMerge tag 'libnvdimm-for-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 20 Jun 2020 20:13:21 +0000 (13:13 -0700)]
Merge tag 'libnvdimm-for-5.8-rc2' of git://git./linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm updates from Dan Williams:
 "A feature (papr_scm health retrieval) and a fix (sysfs attribute
  visibility) for v5.8.

  Vaibhav explains in the merge commit below why missing v5.8 would be
  painful and I agreed to try a -rc2 pull because only cosmetics kept
  this out of -rc1 and his initial versions were posted in more than
  enough time for v5.8 consideration:

   'These patches are tied to specific features that were committed to
    customers in upcoming distros releases (RHEL and SLES) whose
    time-lines are tied to 5.8 kernel release.

    Being able to track the health of an nvdimm is critical for our
    customers that are running workloads leveraging papr-scm nvdimms.
    Missing the 5.8 kernel would mean missing the distro timelines and
    shifting forward the availability of this feature in distro kernels
    by at least 6 months'

  Summary:

   - Fix the visibility of the region 'align' attribute.

     The new unit tests for region alignment handling caught a corner
     case where the alignment cannot be specified if the region is
     converted from static to dynamic provisioning at runtime.

   - Add support for device health retrieval for the persistent memory
     supported by the papr_scm driver.

     This includes both the standard sysfs "health flags" that the nfit
     persistent memory driver publishes and a mechanism for the ndctl
     tool to retrieve a health-command payload"

* tag 'libnvdimm-for-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
  nvdimm/region: always show the 'align' attribute
  powerpc/papr_scm: Implement support for PAPR_PDSM_HEALTH
  ndctl/papr_scm,uapi: Add support for PAPR nvdimm specific methods
  powerpc/papr_scm: Improve error logging and handling papr_scm_ndctl()
  powerpc/papr_scm: Fetch nvdimm health information from PHYP
  seq_buf: Export seq_buf_printf
  powerpc: Document details on H_SCM_HEALTH hcall

4 years agoMerge tag 's390-5.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Linus Torvalds [Sat, 20 Jun 2020 19:31:08 +0000 (12:31 -0700)]
Merge tag 's390-5.8-2' of git://git./linux/kernel/git/s390/linux

Pull s390 fixes from Vasily Gorbik:

 - a few ptrace fixes mostly for strace and seccomp_bpf kernel tests
   findings

 - cleanup unused pm callbacks in virtio ccw

 - replace kmalloc + memset with kzalloc in crypto

 - use $(LD) for vDSO linkage to make clang happy

 - fix vDSO clock_getres() to preserve the same behaviour as
   posix_get_hrtimer_res()

 - fix workqueue cpumask warning when NUMA=n and nr_node_ids=2

 - reduce SLSB writes during input processing, improve warnings and
   cleanup qdio_data usage in qdio

 - a few fixes to use scnprintf() instead of snprintf()

* tag 's390-5.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390: fix syscall_get_error for compat processes
  s390/qdio: warn about unexpected SLSB states
  s390/qdio: clean up usage of qdio_data
  s390/numa: let NODES_SHIFT depend on NEED_MULTIPLE_NODES
  s390/vdso: fix vDSO clock_getres()
  s390/vdso: Use $(LD) instead of $(CC) to link vDSO
  s390/protvirt: use scnprintf() instead of snprintf()
  s390: use scnprintf() in sys_##_prefix##_##_name##_show
  s390/crypto: use scnprintf() instead of snprintf()
  s390/zcrypt: use kzalloc
  s390/virtio: remove unused pm callbacks
  s390/qdio: reduce SLSB writes during Input Queue processing
  selftests/seccomp: s390 shares the syscall and return value register
  s390/ptrace: fix setting syscall number
  s390/ptrace: pass invalid syscall numbers to tracing
  s390/ptrace: return -ENOSYS when invalid syscall is supplied
  s390/seccomp: pass syscall arguments via seccomp_data
  s390/qdio: fine-tune SLSB update

4 years agoMerge tag 'riscv-for-linus-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 20 Jun 2020 19:14:29 +0000 (12:14 -0700)]
Merge tag 'riscv-for-linus-5.8-rc2' of git://git./linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:

 - a workaround for a compiler surprise related to the "r" inline
   assembly that allows LLVM to boot.

 - a fix to avoid WX-only mappings, which the ISA does not allow. While
   this probably manifests in many ways, the bug was found in stress-ng.

 - a missing lock in set_direct_map_*(), which due to a recent lockdep
   change started asserting.

* tag 'riscv-for-linus-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  RISC-V: Acquire mmap lock before invoking walk_page_range
  RISC-V: Don't allow write+exec only page mapping request in mmap
  riscv/atomic: Fix sign extension for RV64I

4 years agoMerge tag 'linux-kselftest-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 20 Jun 2020 19:10:09 +0000 (12:10 -0700)]
Merge tag 'linux-kselftest-5.8-rc2' of git://git./linux/kernel/git/shuah/linux-kselftest

Pull kselftest cleanups from Shuah Khan:

 - ftrace "requires:" list for simplifying and unifying requirement
   checks for each test case, adding "requires:" line instead of
   checking required ftrace interfaces in each test case.

 - a minor spelling correction patch

* tag 'linux-kselftest-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  selftests/ftrace: Support ":README" suffix for requires
  selftests/ftrace: Support ":tracer" suffix for requires
  selftests/ftrace: Convert check_filter_file() with requires list
  selftests/ftrace: Convert required interface checks into requires list
  selftests/ftrace: Add "requires:" list support
  selftests/ftrace: Return unsupported for the unconfigured features
  selftests/ftrace: Allow ":" in description
  tools: testing: ftrace: trigger: fix spelling mistake

4 years agoafs: Fix hang on rmmod due to outstanding timer
David Howells [Fri, 19 Jun 2020 22:39:36 +0000 (23:39 +0100)]
afs: Fix hang on rmmod due to outstanding timer

The fileserver probe timer, net->fs_probe_timer, isn't cancelled when
the kafs module is being removed and so the count it holds on
net->servers_outstanding doesn't get dropped..

This causes rmmod to wait forever.  The hung process shows a stack like:

afs_purge_servers+0x1b5/0x23c [kafs]
afs_net_exit+0x44/0x6e [kafs]
ops_exit_list+0x72/0x93
unregister_pernet_operations+0x14c/0x1ba
unregister_pernet_subsys+0x1d/0x2a
afs_exit+0x29/0x6f [kafs]
__do_sys_delete_module.isra.0+0x1a2/0x24b
do_syscall_64+0x51/0x95
entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fix this by:

 (1) Attempting to cancel the probe timer and, if successful, drop the
     count that the timer was holding.

 (2) Make the timer function just drop the count and not schedule the
     prober if the afs portion of net namespace is being destroyed.

Also, whilst we're at it, make the following changes:

 (3) Initialise net->servers_outstanding to 1 and decrement it before
     waiting on it so that it doesn't generate wake up events by being
     decremented to 0 until we're cleaning up.

 (4) Switch the atomic_dec() on ->servers_outstanding for ->fs_timer in
     afs_purge_servers() to use the helper function for that.

Fixes: f6cbb368bcb0 ("afs: Actively poll fileservers to maintain NAT or firewall openings")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoafs: Fix afs_do_lookup() to call correct fetch-status op variant
David Howells [Thu, 18 Jun 2020 23:01:28 +0000 (00:01 +0100)]
afs: Fix afs_do_lookup() to call correct fetch-status op variant

Fix afs_do_lookup()'s fallback case for when FS.InlineBulkStatus isn't
supported by the server.

In the fallback, it calls FS.FetchStatus for the specific vnode it's
meant to be looking up.  Commit b6489a49f7b7 broke this by renaming one
of the two identically-named afs_fetch_status_operation descriptors to
something else so that one of them could be made non-static.  The site
that used the renamed one, however, wasn't renamed and didn't produce
any warning because the other was declared in a header.

Fix this by making afs_do_lookup() use the renamed variant.

Note that there are two variants of the success method because one is
called from ->lookup() where we may or may not have an inode, but can't
call iget until after we've talked to the server - whereas the other is
called from within iget where we have an inode, but it may or may not be
initialised.

The latter variant expects there to be an inode, but because it's being
called from there former case, there might not be - resulting in an oops
like the following:

  BUG: kernel NULL pointer dereference, address: 00000000000000b0
  ...
  RIP: 0010:afs_fetch_status_success+0x27/0x7e
  ...
  Call Trace:
    afs_wait_for_operation+0xda/0x234
    afs_do_lookup+0x2fe/0x3c1
    afs_lookup+0x3c5/0x4bd
    __lookup_slow+0xcd/0x10f
    walk_component+0xa2/0x10c
    path_lookupat.isra.0+0x80/0x110
    filename_lookup+0x81/0x104
    vfs_statx+0x76/0x109
    __do_sys_newlstat+0x39/0x6b
    do_syscall_64+0x4c/0x78
    entry_SYSCALL_64_after_hwframe+0x44/0xa9

Fixes: b6489a49f7b7 ("afs: Fix silly rename")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoMerge branch 'for-5.8/papr_scm' into libnvdimm-for-next
Dan Williams [Fri, 19 Jun 2020 21:18:51 +0000 (14:18 -0700)]
Merge branch 'for-5.8/papr_scm' into libnvdimm-for-next

Include the papr_scm health retrieval feature for v5.8-rc2. The
functionality was initially posted well in advance of the merge window,
but review comments and a late build-bot warning kept them out of the
v5.8-rc1 libnvdimm pull request.

Vaibhav notes:
These patches are tied to specific features that were committed to
customers in upcoming distros releases (RHEL and SLES) whose time-lines
are tied to 5.8 kernel release.

Being able to track the health of an nvdimm is critical for our
customers that are running workloads leveraging papr-scm nvdimms.
Missing the 5.8 kernel would mean missing the distro timelines and
shifting forward the availability of this feature in distro kernels by
at least 6 months.

4 years agoMerge tag 'io_uring-5.8-2020-06-19' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 19 Jun 2020 20:16:58 +0000 (13:16 -0700)]
Merge tag 'io_uring-5.8-2020-06-19' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:

 - Catch a case where io_sq_thread() didn't do proper mm acquire

 - Ensure poll completions are reaped on shutdown

 - Async cancelation and run fixes (Pavel)

 - io-poll race fixes (Xiaoguang)

 - Request cleanup race fix (Xiaoguang)

* tag 'io_uring-5.8-2020-06-19' of git://git.kernel.dk/linux-block:
  io_uring: fix possible race condition against REQ_F_NEED_CLEANUP
  io_uring: reap poll completions while waiting for refs to drop on exit
  io_uring: acquire 'mm' for task_work for SQPOLL
  io_uring: add memory barrier to synchronize io_kiocb's result and iopoll_completed
  io_uring: don't fail links for EAGAIN error in IOPOLL mode
  io_uring: cancel by ->task not pid
  io_uring: lazy get task
  io_uring: batch cancel in io_uring_cancel_files()
  io_uring: cancel all task's requests on exit
  io-wq: add an option to cancel all matched reqs
  io-wq: reorder cancellation pending -> running
  io_uring: fix lazy work init

4 years agoMerge tag 'block-5.8-2020-06-19' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 19 Jun 2020 20:11:26 +0000 (13:11 -0700)]
Merge tag 'block-5.8-2020-06-19' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - Use import_uuid() where appropriate (Andy)

 - bcache fixes (Coly, Mauricio, Zhiqiang)

 - blktrace sparse warnings fix (Jan)

 - blktrace concurrent setup fix (Luis)

 - blkdev_get use-after-free fix (Jason)

 - Ensure all blk-mq maps are updated (Weiping)

 - Loop invalidate bdev fix (Zheng)

* tag 'block-5.8-2020-06-19' of git://git.kernel.dk/linux-block:
  block: make function 'kill_bdev' static
  loop: replace kill_bdev with invalidate_bdev
  partitions/ldm: Replace uuid_copy() with import_uuid() where it makes sense
  block: update hctx map when use multiple maps
  blktrace: Avoid sparse warnings when assigning q->blk_trace
  blktrace: break out of blktrace setup on concurrent calls
  block: Fix use-after-free in blkdev_get()
  trace/events/block.h: drop kernel-doc for dropped function parameter
  blk-mq: Remove redundant 'return' statement
  bcache: pr_info() format clean up in bcache_device_init()
  bcache: use delayed kworker fo asynchronous devices registration
  bcache: check and adjust logical block size for backing devices
  bcache: fix potential deadlock problem in btree_gc_coalesce

4 years agoMerge tag 'libata-5.8-2020-06-19' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 19 Jun 2020 20:09:40 +0000 (13:09 -0700)]
Merge tag 'libata-5.8-2020-06-19' of git://git.kernel.dk/linux-block

Pull libata fixes from Jens Axboe:
 "A few minor changes that should go into this release"

* tag 'libata-5.8-2020-06-19' of git://git.kernel.dk/linux-block:
  libata: Use per port sync for detach
  ata/libata: Fix usage of page address by page_address in ata_scsi_mode_select_xlat function
  sata_rcar: handle pm_runtime_get_sync failure cases

4 years agoMerge tag 'drm-fixes-2020-06-19' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Fri, 19 Jun 2020 19:40:57 +0000 (12:40 -0700)]
Merge tag 'drm-fixes-2020-06-19' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Just i915 and amd here.

  i915 has some workaround movement so they get applied at the right
  times, and a timeslicing fix, along with some display fixes.

  AMD has a few display floating point fix and a devcgroup fix for
  amdkfd.

  i915:
   - Fix for timeslicing and virtual engines/unpremptable requests (+ 1
     dependency patch)
   - Fixes into TypeC register programming and interrupt storm detecting
   - Disable DIP on MST ports with the transcoder clock still on
   - Avoid missing GT workarounds at reset for HSW and older gens
   - Fix for unwinding multiple requests missing force restore
   - Fix encoder type check for DDI vswing sequence
   - Build warning fixes

  amdgpu:
   - Fix kvfree/kfree mixup
   - Fix hawaii device id in powertune configuration
   - Display FP fixes
   - Documentation fixes

  amdkfd:
   - devcgroup check fix"

* tag 'drm-fixes-2020-06-19' of git://anongit.freedesktop.org/drm/drm: (23 commits)
  drm/amdgpu: fix documentation around busy_percentage
  drm/amdgpu/pm: update comment to clarify Overdrive interfaces
  drm/amdkfd: Use correct major in devcgroup check
  drm/i915/display: Fix the encoder type check
  drm/i915/icl+: Fix hotplug interrupt disabling after storm detection
  drm/i915/gt: Move gen4 GT workarounds from init_clock_gating to workarounds
  drm/i915/gt: Move ilk GT workarounds from init_clock_gating to workarounds
  drm/i915/gt: Move snb GT workarounds from init_clock_gating to workarounds
  drm/i915/gt: Move vlv GT workarounds from init_clock_gating to workarounds
  drm/i915/gt: Move ivb GT workarounds from init_clock_gating to workarounds
  drm/i915/gt: Move hsw GT workarounds from init_clock_gating to workarounds
  drm/i915/icl: Disable DIP on MST ports with the transcoder clock still on
  drm/i915/gt: Incrementally check for rewinding
  drm/i915/tc: fix the reset of ln0
  drm/i915/gt: Prevent timeslicing into unpreemptable requests
  drm/i915/selftests: Restore to default heartbeat
  drm/i915: work around false-positive maybe-uninitialized warning
  drm/i915/pmu: avoid an maybe-uninitialized warning
  drm/i915/gt: Incorporate the virtual engine into timeslicing
  drm/amd/display: Rework dsc to isolate FPU operations
  ...

4 years agoMerge tag 'ceph-for-5.8-rc2' of git://github.com/ceph/ceph-client
Linus Torvalds [Fri, 19 Jun 2020 19:25:04 +0000 (12:25 -0700)]
Merge tag 'ceph-for-5.8-rc2' of git://github.com/ceph/ceph-client

Pull ceph fixes from Ilya Dryomov:
 "An important follow-up for replica reads support that went into -rc1
  and two target_copy() fixups"

* tag 'ceph-for-5.8-rc2' of git://github.com/ceph/ceph-client:
  libceph: don't omit used_replica in target_copy()
  libceph: don't omit recovery_deletes in target_copy()
  libceph: move away from global osd_req_flags

4 years agoMerge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Linus Torvalds [Fri, 19 Jun 2020 19:19:12 +0000 (12:19 -0700)]
Merge tag 'arm64-fixes' of git://git./linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "Unfortunately, we still have a number of outstanding issues so there
  will be more fixes to come, but this lot are a good start.

   - Fix handling of watchpoints triggered by uaccess routines

   - Fix initialisation of gigantic pages for CMA buffers

   - Raise minimum clang version for BTI to avoid miscompilation

   - Fix data race in SVE vector length configuration code

   - Ensure address tags are ignored in kern_addr_valid()

   - Dump register state on fatal BTI exception

   - kexec_file() cleanup to use struct_size() macro"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: hw_breakpoint: Don't invoke overflow handler on uaccess watchpoints
  arm64: kexec_file: Use struct_size() in kmalloc()
  arm64: mm: reserve hugetlb CMA after numa_init
  arm64: bti: Require clang >= 10.0.1 for in-kernel BTI support
  arm64: sve: Fix build failure when ARM64_SVE=y and SYSCTL=n
  arm64: pgtable: Clear the GP bit for non-executable kernel pages
  arm64: mm: reset address tag set by kasan sw tagging
  arm64: traps: Dump registers prior to panic() in bad_mode()
  arm64/sve: Eliminate data races on sve_default_vl
  docs/arm64: Fix typo'd #define in sve.rst
  arm64: remove TEXT_OFFSET randomization

4 years agoMerge tag 'overflow-v5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees...
Linus Torvalds [Fri, 19 Jun 2020 18:45:03 +0000 (11:45 -0700)]
Merge tag 'overflow-v5.8-rc2' of git://git./linux/kernel/git/kees/linux

Pull flex-array size helper from Kees Cook:
 "During the treewide clean-ups of zero-length "flexible arrays", the
  struct_size() helper was heavily used, but it was noticed that many
  times it would have been nice to have an additional helper to get the
  size of just the flexible array itself.

  This need appears to be even more common when cleaning up the 1-byte
  array "flexible arrays", so Gustavo implemented it.

  I'd love to get this landed early so it can be used during the v5.9
  dev cycle to ease the 1-byte array cleanups."

* tag 'overflow-v5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  overflow.h: Add flex_array_size() helper

4 years agoMerge tag 'perf-tools-fixes-2020-06-02' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Fri, 19 Jun 2020 18:39:57 +0000 (11:39 -0700)]
Merge tag 'perf-tools-fixes-2020-06-02' of git://git./linux/kernel/git/acme/linux

Pull perf tooling fixes from Arnaldo Carvalho de Melo:

 - Update various UAPI headers, some automatically adding support for a
   new MSR and the faccess2 syscall.

 - Fix corner case NULL deref in the histograms code.

 - Fix corner case NULL deref in 'perf stat' aggregation code.

 - Fix array pointer deref and old style declaration in the parsing of
   events.

 - Fix segfault when processing ZSTD compressed perf.data files in 'perf
   script' due to lack of initialization of the ZSTD library.

 - Handle __attribute__((user)) in libtraceevent fixing the parsing of
   syscall tracepoints with user buffers.

 - Make libtraevent aware of __builtin_expect() appearing in tracepoint
   fields.

 - Make the BPF prologue generation use bpf_probe_read_{user,kernel}().

 - Fix the '@user' attribute parsing in kprobes variables in 'perf
   probe'.

 - Fix error message when asking for -fsanitize=address without required
   libraries.

* tag 'perf-tools-fixes-2020-06-02' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux: (22 commits)
  perf build: Fix error message when asking for -fsanitize=address without required libraries
  tools lib traceevent: Add handler for __builtin_expect()
  tools lib traceevent: Handle __attribute__((user)) in field names
  tools lib traceevent: Add append() function helper for appending strings
  tools headers UAPI: Sync linux/fs.h with the kernel sources
  tools include UAPI: Sync linux/vhost.h with the kernel sources
  tools arch x86: Sync the msr-index.h copy with the kernel sources
  perf script: Initialize zstd_data
  perf pmu: Remove unused declaration
  perf parse-events: Fix an old style declaration
  perf parse-events: Fix an incompatible pointer
  perf bpf: Fix bpf prologue generation
  perf probe: Fix user attribute access in kprobes
  perf stat: Fix NULL pointer dereference
  perf report: Fix NULL pointer dereference in hists__fprintf_nr_sample_events()
  tools headers UAPI: Sync kvm.h headers with the kernel sources
  tools headers UAPI: Sync drm/i915_drm.h with the kernel sources
  tools headers UAPI: Sync linux/fscrypt.h with the kernel sources
  perf beauty: Add support to STATX_MNT_ID in the 'statx' syscall 'mask' argument
  tools headers uapi: Sync linux/stat.h with the kernel sources
  ...

4 years agoMAINTAINERS: Add robert and myself as qcom i2c cci maintainers
Loic Poulain [Fri, 19 Jun 2020 10:17:44 +0000 (12:17 +0200)]
MAINTAINERS: Add robert and myself as qcom i2c cci maintainers

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
[wsa: kept sorting]
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: smbus: Fix spelling mistake in the comments
Keyur Patel [Fri, 12 Jun 2020 21:26:35 +0000 (17:26 -0400)]
i2c: smbus: Fix spelling mistake in the comments

Fix spelling mistake in the comments with help of `codespell`.
seperate ==> separate

Signed-off-by: Keyur Patel <iamkeyur96@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoDocumentation/i2c: SMBus start signal is S not A
Daniel Schaefer [Sun, 14 Jun 2020 18:23:55 +0000 (20:23 +0200)]
Documentation/i2c: SMBus start signal is S not A

Just like all other I2C/SMBus commands, the start signal for the SMBus
Quick Command is S, not A.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Daniel Schaefer <git@danielschaefer.me>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoi2c: remove deprecated i2c_new_device API
Wolfram Sang [Mon, 15 Jun 2020 07:58:15 +0000 (09:58 +0200)]
i2c: remove deprecated i2c_new_device API

All in-tree users have been converted to the new i2c_new_client_device
function, so remove this deprecated one.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoDocumentation: media: convert to use i2c_new_client_device()
Wolfram Sang [Mon, 15 Jun 2020 07:58:14 +0000 (09:58 +0200)]
Documentation: media: convert to use i2c_new_client_device()

Move away from the deprecated API and advertise the new one.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agovideo: backlight: tosa_lcd: convert to use i2c_new_client_device()
Wolfram Sang [Mon, 15 Jun 2020 07:58:13 +0000 (09:58 +0200)]
video: backlight: tosa_lcd: convert to use i2c_new_client_device()

Move away from the deprecated API and return the shiny new ERRPTR where
useful.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agox86/platform/intel-mid: convert to use i2c_new_client_device()
Wolfram Sang [Mon, 15 Jun 2020 07:58:12 +0000 (09:58 +0200)]
x86/platform/intel-mid: convert to use i2c_new_client_device()

Move away from the deprecated API and return the shiny new ERRPTR where
useful.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodrm: encoder_slave: use new I2C API
Wolfram Sang [Mon, 15 Jun 2020 07:58:11 +0000 (09:58 +0200)]
drm: encoder_slave: use new I2C API

i2c_new_client() is deprecated, use the replacement
i2c_new_client_device(). Also, we have a helper to check if a driver is
bound. Use it to simplify the code. Note that this changes the errno for
a failed device creation from ENOMEM to ENODEV. No callers currently
interpret this errno, though, so we use this condensed error check.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agodrm: encoder_slave: fix refcouting error for modules
Wolfram Sang [Mon, 15 Jun 2020 07:58:10 +0000 (09:58 +0200)]
drm: encoder_slave: fix refcouting error for modules

module_put() balances try_module_get(), not request_module(). Fix the
error path to match that.

Fixes: 2066facca4c7 ("drm/kms: slave encoder interface.")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
4 years agoRISC-V: Acquire mmap lock before invoking walk_page_range
Atish Patra [Wed, 17 Jun 2020 20:37:32 +0000 (13:37 -0700)]
RISC-V: Acquire mmap lock before invoking walk_page_range

As per walk_page_range documentation, mmap lock should be acquired by the
caller before invoking walk_page_range. mmap_assert_locked gets triggered
without that. The details can be found here.

http://lists.infradead.org/pipermail/linux-riscv/2020-June/010335.html

Fixes: 395a21ff859c(riscv: add ARCH_HAS_SET_DIRECT_MAP support)
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Michel Lespinasse <walken@google.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
4 years agoRISC-V: Don't allow write+exec only page mapping request in mmap
Yash Shah [Tue, 16 Jun 2020 14:03:06 +0000 (19:33 +0530)]
RISC-V: Don't allow write+exec only page mapping request in mmap

As per the table 4.4 of version "20190608-Priv-MSU-Ratified" of the
RISC-V instruction set manual[0], the PTE permission bit combination of
"write+exec only" is reserved for future use. Hence, don't allow such
mapping request in mmap call.

An issue is been reported by David Abdurachmanov, that while running
stress-ng with "sysbadaddr" argument, RCU stalls are observed on RISC-V
specific kernel.

This issue arises when the stress-sysbadaddr request for pages with
"write+exec only" permission bits and then passes the address obtain
from this mmap call to various system call. For the riscv kernel, the
mmap call should fail for this particular combination of permission bits
since it's not valid.

[0]: http://dabbelt.com/~palmer/keep/riscv-isa-manual/riscv-privileged-20190608-1.pdf

Signed-off-by: Yash Shah <yash.shah@sifive.com>
Reported-by: David Abdurachmanov <david.abdurachmanov@gmail.com>
[Palmer: Refer to the latest ISA specification at the only link I could
find, and update the terminology.]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
4 years agoMerge tag 'amd-drm-fixes-5.8-2020-06-17' of git://people.freedesktop.org/~agd5f/linux...
Dave Airlie [Fri, 19 Jun 2020 00:02:28 +0000 (10:02 +1000)]
Merge tag 'amd-drm-fixes-5.8-2020-06-17' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

amd-drm-fixes-5.8-2020-06-17:

amdgpu:
- Fix kvfree/kfree mixup
- Fix hawaii device id in powertune configuration
- Display FP fixes
- Documentation fixes

amdkfd:
- devcgroup check fix

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Alex Deucher <alexdeucher@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200617220733.3773183-1-alexander.deucher@amd.com
4 years agoMerge tag 'drm-intel-fixes-2020-06-18' of git://anongit.freedesktop.org/drm/drm-intel...
Dave Airlie [Thu, 18 Jun 2020 23:45:47 +0000 (09:45 +1000)]
Merge tag 'drm-intel-fixes-2020-06-18' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

- Fix for timeslicing and virtual engines/unpremptable requests
  (+ 1 dependency patch)
- Fixes into TypeC register programming and interrupt storm detecting
- Disable DIP on MST ports with the transcoder clock still on
- Avoid missing GT workarounds at reset for HSW and older gens
- Fix for unwinding multiple requests missing force restore
- Fix encoder type check for DDI vswing sequence
- Build warning fixes

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200618124659.GA12342@jlahtine-desk.ger.corp.intel.com
4 years agoMerge branch 'hch' (maccess patches from Christoph Hellwig)
Linus Torvalds [Thu, 18 Jun 2020 19:35:51 +0000 (12:35 -0700)]
Merge branch 'hch' (maccess patches from Christoph Hellwig)

Merge non-faulting memory access cleanups from Christoph Hellwig:
 "Andrew and I decided to drop the patches implementing your suggested
  rename of the probe_kernel_* and probe_user_* helpers from -mm as
  there were way to many conflicts.

  After -rc1 might be a good time for this as all the conflicts are
  resolved now"

This also adds a type safety checking patch on top of the renaming
series to make the subtle behavioral difference between 'get_user()' and
'get_kernel_nofault()' less potentially dangerous and surprising.

* emailed patches from Christoph Hellwig <hch@lst.de>:
  maccess: make get_kernel_nofault() check for minimal type compatibility
  maccess: rename probe_kernel_address to get_kernel_nofault
  maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault
  maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault

4 years agomaccess: make get_kernel_nofault() check for minimal type compatibility
Linus Torvalds [Thu, 18 Jun 2020 19:10:37 +0000 (12:10 -0700)]
maccess: make get_kernel_nofault() check for minimal type compatibility

Now that we've renamed probe_kernel_address() to get_kernel_nofault()
and made it look and behave more in line with get_user(), some of the
subtle type behavior differences end up being more obvious and possibly
dangerous.

When you do

        get_user(val, user_ptr);

the type of the access comes from the "user_ptr" part, and the above
basically acts as

        val = *user_ptr;

by design (except, of course, for the fact that the actual dereference
is done with a user access).

Note how in the above case, the type of the end result comes from the
pointer argument, and then the value is cast to the type of 'val' as
part of the assignment.

So the type of the pointer is ultimately the more important type both
for the access itself.

But 'get_kernel_nofault()' may now _look_ similar, but it behaves very
differently.  When you do

        get_kernel_nofault(val, kernel_ptr);

it behaves like

        val = *(typeof(val) *)kernel_ptr;

except, of course, for the fact that the actual dereference is done with
exception handling so that a faulting access is suppressed and returned
as the error code.

But note how different the casting behavior of the two superficially
similar accesses are: one does the actual access in the size of the type
the pointer points to, while the other does the access in the size of
the target, and ignores the pointer type entirely.

Actually changing get_kernel_nofault() to act like get_user() is almost
certainly the right thing to do eventually, but in the meantime this
patch adds logit to at least verify that the pointer type is compatible
with the type of the result.

In many cases, this involves just casting the pointer to 'void *' to
make it obvious that the type of the pointer is not the important part.
It's not how 'get_user()' acts, but at least the behavioral difference
is now obvious and explicit.

Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomaccess: rename probe_kernel_address to get_kernel_nofault
Christoph Hellwig [Wed, 17 Jun 2020 07:37:55 +0000 (09:37 +0200)]
maccess: rename probe_kernel_address to get_kernel_nofault

Better describe what this helper does, and match the naming of
copy_from_kernel_nofault.

Also switch the argument order around, so that it acts and looks
like get_user().

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agosparse: use identifiers to define address spaces
Luc Van Oostenryck [Wed, 17 Jun 2020 22:02:26 +0000 (00:02 +0200)]
sparse: use identifiers to define address spaces

Currently, address spaces in warnings are displayed as '<asn:X>' with
'X' being the address space's arbitrary number.

But since sparse v0.6.0-rc1 (late December 2018), sparse allows you to
define the address spaces using an identifier instead of a number.  This
identifier is then directly used in the warnings.

So, use the identifiers '__user', '__iomem', '__percpu' & '__rcu' for
the corresponding address spaces.  The default address space, __kernel,
being not displayed in warnings, stays defined as '0'.

With this change, warnings that used to be displayed as:

cast removes address space '<asn:1>' of expression
... void [noderef] <asn:2> *

will now be displayed as:

cast removes address space '__user' of expression
... void [noderef] __iomem *

This also moves the __kernel annotation to be the first one, since it is
quite different from the others because it's the default one, and so:

 - it's never displayed

 - it's normally not needed, nor in type annotations, nor in cast
   between address spaces. The only time it's needed is when it's
   combined with a typeof to express "the same type as this one but
   without the address space"

 - it can't be defined with a name, '0' must be used.

So, it seemed strange to me to have it in the middle of the other
ones.

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoblock: make function 'kill_bdev' static block-5.8-2020-06-19
Zheng Bin [Thu, 18 Jun 2020 04:21:38 +0000 (12:21 +0800)]
block: make function 'kill_bdev' static

kill_bdev does not have any external user, so make it static.

Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoloop: replace kill_bdev with invalidate_bdev
Zheng Bin [Thu, 18 Jun 2020 04:21:37 +0000 (12:21 +0800)]
loop: replace kill_bdev with invalidate_bdev

When a filesystem is mounted on a loop device and on a loop ioctl
LOOP_SET_STATUS64, because of kill_bdev, buffer_head mappings are getting
destroyed.
kill_bdev
  truncate_inode_pages
    truncate_inode_pages_range
      do_invalidatepage
        block_invalidatepage
          discard_buffer  -->clear BH_Mapped flag

sb_bread
  __bread_gfp
  bh = __getblk_gfp
  -->discard_buffer clear BH_Mapped flag
  __bread_slow
    submit_bh
      submit_bh_wbc
        BUG_ON(!buffer_mapped(bh))  --> hit this BUG_ON

Fixes: 5db470e229e2 ("loop: drop caches if offset or block_size are changed")
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agolibata: Use per port sync for detach libata-5.8 libata-5.8-2020-06-19
Kai-Heng Feng [Wed, 3 Jun 2020 07:48:19 +0000 (15:48 +0800)]
libata: Use per port sync for detach

Commit 130f4caf145c ("libata: Ensure ata_port probe has completed before
detach") may cause system freeze during suspend.

Using async_synchronize_full() in PM callbacks is wrong, since async
callbacks that are already scheduled may wait for not-yet-scheduled
callbacks, causes a circular dependency.

Instead of using big hammer like async_synchronize_full(), use async
cookie to make sure port probe are synced, without affecting other
scheduled PM callbacks.

Fixes: 130f4caf145c ("libata: Ensure ata_port probe has completed before detach")
Suggested-by: John Garry <john.garry@huawei.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: John Garry <john.garry@huawei.com>
BugLink: https://bugs.launchpad.net/bugs/1867983
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agopartitions/ldm: Replace uuid_copy() with import_uuid() where it makes sense
Andy Shevchenko [Wed, 22 Apr 2020 13:03:17 +0000 (16:03 +0300)]
partitions/ldm: Replace uuid_copy() with import_uuid() where it makes sense

There is a specific API to treat raw data as UUID, i.e. import_uuid().
Use it instead of uuid_copy() with explicit casting.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoio_uring: fix possible race condition against REQ_F_NEED_CLEANUP io_uring-5.8-2020-06-19
Xiaoguang Wang [Thu, 18 Jun 2020 07:01:56 +0000 (15:01 +0800)]
io_uring: fix possible race condition against REQ_F_NEED_CLEANUP

In io_read() or io_write(), when io request is submitted successfully,
it'll go through the below sequence:

    kfree(iovec);
    req->flags &= ~REQ_F_NEED_CLEANUP;
    return ret;

But clearing REQ_F_NEED_CLEANUP might be unsafe. The io request may
already have been completed, and then io_complete_rw_iopoll()
and io_complete_rw() will be called, both of which will also modify
req->flags if needed. This causes a race condition, with concurrent
non-atomic modification of req->flags.

To eliminate this race, in io_read() or io_write(), if io request is
submitted successfully, we don't remove REQ_F_NEED_CLEANUP flag. If
REQ_F_NEED_CLEANUP is set, we'll leave __io_req_aux_free() to the
iovec cleanup work correspondingly.

Cc: stable@vger.kernel.org
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoperf build: Fix error message when asking for -fsanitize=address without required...
Tiezhu Yang [Thu, 18 Jun 2020 02:06:01 +0000 (10:06 +0800)]
perf build: Fix error message when asking for -fsanitize=address without required libraries

When build perf with ASan or UBSan, if libasan or libubsan can not find,
the feature-glibc is 0 and there exists the following error log which is
wrong, because we can find gnu/libc-version.h in /usr/include,
glibc-devel is also installed.

  [yangtiezhu@linux perf]$ make DEBUG=1 EXTRA_CFLAGS='-fno-omit-frame-pointer -fsanitize=address'
    BUILD:   Doing 'make -j4' parallel build
    HOSTCC   fixdep.o
    HOSTLD   fixdep-in.o
    LINK     fixdep
  <stdin>:1:0: warning: -fsanitize=address and -fsanitize=kernel-address are not supported for this target
  <stdin>:1:0: warning: -fsanitize=address not supported for this target

  Auto-detecting system features:
  ...                         dwarf: [ OFF ]
  ...            dwarf_getlocations: [ OFF ]
  ...                         glibc: [ OFF ]
  ...                          gtk2: [ OFF ]
  ...                      libaudit: [ OFF ]
  ...                        libbfd: [ OFF ]
  ...                        libcap: [ OFF ]
  ...                        libelf: [ OFF ]
  ...                       libnuma: [ OFF ]
  ...        numa_num_possible_cpus: [ OFF ]
  ...                       libperl: [ OFF ]
  ...                     libpython: [ OFF ]
  ...                     libcrypto: [ OFF ]
  ...                     libunwind: [ OFF ]
  ...            libdw-dwarf-unwind: [ OFF ]
  ...                          zlib: [ OFF ]
  ...                          lzma: [ OFF ]
  ...                     get_cpuid: [ OFF ]
  ...                           bpf: [ OFF ]
  ...                        libaio: [ OFF ]
  ...                       libzstd: [ OFF ]
  ...        disassembler-four-args: [ OFF ]

  Makefile.config:393: *** No gnu/libc-version.h found, please install glibc-dev[el].  Stop.
  Makefile.perf:224: recipe for target 'sub-make' failed
  make[1]: *** [sub-make] Error 2
  Makefile:69: recipe for target 'all' failed
  make: *** [all] Error 2
  [yangtiezhu@linux perf]$ ls /usr/include/gnu/libc-version.h
  /usr/include/gnu/libc-version.h

After install libasan and libubsan, the feature-glibc is 1 and the build
process is success, so the cause is related with libasan or libubsan, we
should check them and print an error log to reflect the reality.

Committer testing:

  $ rm -rf /tmp/build/perf ; mkdir -p /tmp/build/perf
  $ make DEBUG=1 EXTRA_CFLAGS='-fno-omit-frame-pointer -fsanitize=address' O=/tmp/build/perf -C tools/perf/ install-bin
  make: Entering directory '/home/acme/git/perf/tools/perf'
    BUILD:   Doing 'make -j12' parallel build
    HOSTCC   /tmp/build/perf/fixdep.o
    HOSTLD   /tmp/build/perf/fixdep-in.o
    LINK     /tmp/build/perf/fixdep

  Auto-detecting system features:
  ...                         dwarf: [ OFF ]
  ...            dwarf_getlocations: [ OFF ]
  ...                         glibc: [ OFF ]
  ...                          gtk2: [ OFF ]
  ...                        libbfd: [ OFF ]
  ...                        libcap: [ OFF ]
  ...                        libelf: [ OFF ]
  ...                       libnuma: [ OFF ]
  ...        numa_num_possible_cpus: [ OFF ]
  ...                       libperl: [ OFF ]
  ...                     libpython: [ OFF ]
  ...                     libcrypto: [ OFF ]
  ...                     libunwind: [ OFF ]
  ...            libdw-dwarf-unwind: [ OFF ]
  ...                          zlib: [ OFF ]
  ...                          lzma: [ OFF ]
  ...                     get_cpuid: [ OFF ]
  ...                           bpf: [ OFF ]
  ...                        libaio: [ OFF ]
  ...                       libzstd: [ OFF ]
  ...        disassembler-four-args: [ OFF ]

  Makefile.config:401: *** No libasan found, please install libasan.  Stop.
  make[1]: *** [Makefile.perf:231: sub-make] Error 2
  make: *** [Makefile:70: all] Error 2
  make: Leaving directory '/home/acme/git/perf/tools/perf'
  $
  $
  $ sudo dnf install libasan
  <SNIP>
  Installed:
    libasan-9.3.1-2.fc31.x86_64
  $
  $
  $ make DEBUG=1 EXTRA_CFLAGS='-fno-omit-frame-pointer -fsanitize=address' O=/tmp/build/perf -C tools/perf/ install-bin
  make: Entering directory '/home/acme/git/perf/tools/perf'
    BUILD:   Doing 'make -j12' parallel build

  Auto-detecting system features:
  ...                         dwarf: [ on  ]
  ...            dwarf_getlocations: [ on  ]
  ...                         glibc: [ on  ]
  ...                          gtk2: [ on  ]
  ...                        libbfd: [ on  ]
  ...                        libcap: [ on  ]
  ...                        libelf: [ on  ]
  ...                       libnuma: [ on  ]
  ...        numa_num_possible_cpus: [ on  ]
  ...                       libperl: [ on  ]
  ...                     libpython: [ on  ]
  ...                     libcrypto: [ on  ]
  ...                     libunwind: [ on  ]
  ...            libdw-dwarf-unwind: [ on  ]
  ...                          zlib: [ on  ]
  ...                          lzma: [ on  ]
  ...                     get_cpuid: [ on  ]
  ...                           bpf: [ on  ]
  ...                        libaio: [ on  ]
  ...                       libzstd: [ on  ]
  ...        disassembler-four-args: [ on  ]
   <SNIP>
    CC       /tmp/build/perf/util/pmu-flex.o
    FLEX     /tmp/build/perf/util/expr-flex.c
    CC       /tmp/build/perf/util/expr-bison.o
    CC       /tmp/build/perf/util/expr.o
    CC       /tmp/build/perf/util/expr-flex.o
    CC       /tmp/build/perf/util/parse-events-flex.o
    CC       /tmp/build/perf/util/parse-events.o
    LD       /tmp/build/perf/util/intel-pt-decoder/perf-in.o
    LD       /tmp/build/perf/util/perf-in.o
    LD       /tmp/build/perf/perf-in.o
    LINK     /tmp/build/perf/perf
  <SNIP>
    INSTALL  python-scripts
    INSTALL  perf_completion-script
    INSTALL  perf-tip
  make: Leaving directory '/home/acme/git/perf/tools/perf'
  $ ldd ~/bin/perf | grep asan
   libasan.so.5 => /lib64/libasan.so.5 (0x00007f0904164000)
  $

And if we rebuild without -fsanitize-address:

  $ rm -rf /tmp/build/perf ; mkdir -p /tmp/build/perf
  $ make O=/tmp/build/perf -C tools/perf/ install-bin
  make: Entering directory '/home/acme/git/perf/tools/perf'
    BUILD:   Doing 'make -j12' parallel build
    HOSTCC   /tmp/build/perf/fixdep.o
    HOSTLD   /tmp/build/perf/fixdep-in.o
    LINK     /tmp/build/perf/fixdep

  Auto-detecting system features:
  ...                         dwarf: [ on  ]
  ...            dwarf_getlocations: [ on  ]
  ...                         glibc: [ on  ]
  ...                          gtk2: [ on  ]
  ...                        libbfd: [ on  ]
  ...                        libcap: [ on  ]
  ...                        libelf: [ on  ]
  ...                       libnuma: [ on  ]
  ...        numa_num_possible_cpus: [ on  ]
  ...                       libperl: [ on  ]
  ...                     libpython: [ on  ]
  ...                     libcrypto: [ on  ]
  ...                     libunwind: [ on  ]
  ...            libdw-dwarf-unwind: [ on  ]
  ...                          zlib: [ on  ]
  ...                          lzma: [ on  ]
  ...                     get_cpuid: [ on  ]
  ...                           bpf: [ on  ]
  ...                        libaio: [ on  ]
  ...                       libzstd: [ on  ]
  ...        disassembler-four-args: [ on  ]

    GEN      /tmp/build/perf/common-cmds.h
    CC       /tmp/build/perf/exec-cmd.o
  <SNIP>
    INSTALL  perf_completion-script
    INSTALL  perf-tip
  make: Leaving directory '/home/acme/git/perf/tools/perf'
  $ ldd ~/bin/perf | grep asan
  $

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: tiezhu yang <yangtiezhu@loongson.cn>
Cc: xuefeng li <lixuefeng@loongson.cn>
Link: http://lore.kernel.org/lkml/1592445961-28044-1-git-send-email-yangtiezhu@loongson.cn
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agotools lib traceevent: Add handler for __builtin_expect()
Steven Rostedt (VMware) [Tue, 24 Mar 2020 20:08:48 +0000 (16:08 -0400)]
tools lib traceevent: Add handler for __builtin_expect()

In order to move pointer checks like IS_ERR_VALUE() out of the hotpath
and into the reader path of a trace event, user space tools need to be
able to parse that. IS_ERR_VALUE() is defined as:

 #define IS_ERR_VALUE() unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)

Which eventually turns into:

  __builtin_expect(!!((unsigned long)(void *)(x) >= (unsigned long)-4095), 0)

Now the traceevent parser can handle most of that except for the
__builtin_expect(), which needs to be added.

Link: https://lore.kernel.org/linux-mm/20200320055823.27089-3-jaewon31.kim@samsung.com/
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jaewon Kim <jaewon31.kim@samsung.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kees Kook <keescook@chromium.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: linux-mm@kvack.org
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200324200956.821799393@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agotools lib traceevent: Handle __attribute__((user)) in field names
Steven Rostedt (VMware) [Tue, 24 Mar 2020 20:08:47 +0000 (16:08 -0400)]
tools lib traceevent: Handle __attribute__((user)) in field names

Commit c61f13eaa1ee1 ("gcc-plugins: Add structleak for more stack
initialization") added "__attribute__((user))" to the user when
stackleak detector is enabled. This now appears in the field format of
system call trace events for system calls that have user buffers. The
"__attribute__((user))" breaks the parsing in libtraceevent. That needs
to be handled.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jaewon Kim <jaewon31.kim@samsung.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kees Kook <keescook@chromium.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: linux-mm@kvack.org
Cc: linux-trace-devel@vger.kernel.org
Link: http://lore.kernel.org/lkml/20200324200956.663647256@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agotools lib traceevent: Add append() function helper for appending strings
Steven Rostedt (VMware) [Tue, 24 Mar 2020 20:08:46 +0000 (16:08 -0400)]
tools lib traceevent: Add append() function helper for appending strings

There's several locations that open code realloc and strcat() to append
text to strings. Add an append() function that takes a delimiter and a
string to append to another string.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jaewon Lim <jaewon31.kim@samsung.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kees Kook <keescook@chromium.org>
Cc: linux-mm@kvack.org
Cc: linux-trace-devel@vger.kernel.org
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: http://lore.kernel.org/lkml/20200324200956.515118403@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agoarm64: hw_breakpoint: Don't invoke overflow handler on uaccess watchpoints
Will Deacon [Fri, 29 May 2020 13:12:18 +0000 (14:12 +0100)]
arm64: hw_breakpoint: Don't invoke overflow handler on uaccess watchpoints

Unprivileged memory accesses generated by the so-called "translated"
instructions (e.g. STTR) at EL1 can cause EL0 watchpoints to fire
unexpectedly if kernel debugging is enabled. In such cases, the
hw_breakpoint logic will invoke the user overflow handler which will
typically raise a SIGTRAP back to the current task. This is futile when
returning back to the kernel because (a) the signal won't have been
delivered and (b) userspace can't handle the thing anyway.

Avoid invoking the user overflow handler for watchpoints triggered by
kernel uaccess routines, and instead single-step over the faulting
instruction as we would if no overflow handler had been installed.

(Fixes tag identifies the introduction of unprivileged memory accesses,
 which exposed this latent bug in the hw_breakpoint code)

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Fixes: 57f4959bad0a ("arm64: kernel: Add support for User Access Override")
Reported-by: Luis Machado <luis.machado@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoarm64: kexec_file: Use struct_size() in kmalloc()
Gustavo A. R. Silva [Wed, 17 Jun 2020 21:34:07 +0000 (16:34 -0500)]
arm64: kexec_file: Use struct_size() in kmalloc()

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200617213407.GA1385@embeddedor
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoarm64: mm: reserve hugetlb CMA after numa_init
Barry Song [Wed, 17 Jun 2020 21:58:28 +0000 (09:58 +1200)]
arm64: mm: reserve hugetlb CMA after numa_init

hugetlb_cma_reserve() is called at the wrong place. numa_init has not been
done yet. so all reserved memory will be located at node0.

Fixes: cf11e85fc08c ("mm: hugetlb: optionally allocate gigantic hugepages using cma")
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Acked-by: Roman Gushchin <guro@fb.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200617215828.25296-1-song.bao.hua@hisilicon.com
Signed-off-by: Will Deacon <will@kernel.org>
4 years agoblock: update hctx map when use multiple maps
Weiping Zhang [Wed, 17 Jun 2020 06:18:37 +0000 (14:18 +0800)]
block: update hctx map when use multiple maps

There is an issue when tune the number for read and write queues,
if the total queue count was not changed. The hctx->type cannot
be updated, since __blk_mq_update_nr_hw_queues will return directly
if the total queue count has not been changed.

Reproduce:

dmesg | grep "default/read/poll"
[    2.607459] nvme nvme0: 48/0/0 default/read/poll queues
cat /sys/kernel/debug/block/nvme0n1/hctx*/type | sort | uniq -c
     48 default

tune the write queues to 24:
echo 24 > /sys/module/nvme/parameters/write_queues
echo 1 > /sys/block/nvme0n1/device/reset_controller

dmesg | grep "default/read/poll"
[  433.547235] nvme nvme0: 24/24/0 default/read/poll queues

cat /sys/kernel/debug/block/nvme0n1/hctx*/type | sort | uniq -c
     48 default

The driver's hardware queue mapping is not same as block layer.

Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agodrm/amdgpu: fix documentation around busy_percentage
Alex Deucher [Mon, 15 Jun 2020 20:36:49 +0000 (16:36 -0400)]
drm/amdgpu: fix documentation around busy_percentage

Add rename the gpu busy percentage for consistency and
add the mem busy percentage documentation.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 years agodrm/amdgpu/pm: update comment to clarify Overdrive interfaces
Alex Deucher [Mon, 15 Jun 2020 18:29:55 +0000 (14:29 -0400)]
drm/amdgpu/pm: update comment to clarify Overdrive interfaces

Vega10 and previous asics use one interface, vega20 and newer
use another.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
4 years agodrm/amdkfd: Use correct major in devcgroup check
Lorenz Brun [Thu, 11 Jun 2020 20:11:21 +0000 (22:11 +0200)]
drm/amdkfd: Use correct major in devcgroup check

The existing code used the major version number of the DRM driver
instead of the device major number of the DRM subsystem for
validating access for a devices cgroup.

This meant that accesses allowed by the devices cgroup weren't
permitted and certain accesses denied by the devices cgroup were
permitted (if they matched the wrong major device number).

Signed-off-by: Lorenz Brun <lorenz@brun.one>
Fixes: 6b855f7b83d2f ("drm/amdkfd: Check against device cgroup")
Reviewed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
4 years agoftrace: Fix maybe-uninitialized compiler warning
Kaitao Cheng [Fri, 29 May 2020 14:12:14 +0000 (22:12 +0800)]
ftrace: Fix maybe-uninitialized compiler warning

During build compiler reports some 'false positive' warnings about
variables {'seq_ops', 'filtered_pids', 'other_pids'} may be used
uninitialized. This patch silences these warnings.
Also delete some useless spaces

Link: https://lkml.kernel.org/r/20200529141214.37648-1-pilgrimtao@gmail.com
Signed-off-by: Kaitao Cheng <pilgrimtao@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agonvdimm/region: always show the 'align' attribute
Vishal Verma [Wed, 20 May 2020 22:50:26 +0000 (16:50 -0600)]
nvdimm/region: always show the 'align' attribute

It is possible that a platform that is capable of 'namespace labels'
comes up without the labels properly initialized. In this case, the
region's 'align' attribute is hidden. Howerver, once the user does
initialize he labels, the 'align' attribute still stays hidden, which is
unexpected.

The sysfs_update_group() API is meant to address this, and could be
called during region probe, but it has entanglements with the device
'lockdep_mutex'. Therefore, simply make the 'align' attribute always
visible. It doesn't matter what it says for label-less namespaces, since
it is not possible to change their allocation anyway.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/20200520225026.29426-1-vishal.l.verma@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
4 years agoio_uring: reap poll completions while waiting for refs to drop on exit
Jens Axboe [Wed, 17 Jun 2020 21:00:04 +0000 (15:00 -0600)]
io_uring: reap poll completions while waiting for refs to drop on exit

If we're doing polled IO and end up having requests being submitted
async, then completions can come in while we're waiting for refs to
drop. We need to reap these manually, as nobody else will be looking
for them.

Break the wait into 1/20th of a second time waits, and check for done
poll completions if we time out. Otherwise we can have done poll
completions sitting in ctx->poll_list, which needs us to reap them but
we're just waiting for them.

Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agos390: fix syscall_get_error for compat processes
Dmitry V. Levin [Tue, 2 Jun 2020 18:00:51 +0000 (21:00 +0300)]
s390: fix syscall_get_error for compat processes

If both the tracer and the tracee are compat processes, and gprs[2]
is assigned a value by __poke_user_compat, then the higher 32 bits
of gprs[2] are cleared, IS_ERR_VALUE() always returns false, and
syscall_get_error() always returns 0.

Fix the implementation by sign-extending the value for compat processes
the same way as x86 implementation does.

The bug was exposed to user space by commit 201766a20e30f ("ptrace: add
PTRACE_GET_SYSCALL_INFO request") and detected by strace test suite.

This change fixes strace syscall tampering on s390.

Link: https://lkml.kernel.org/r/20200602180051.GA2427@altlinux.org
Fixes: 753c4dd6a2fa2 ("[S390] ptrace changes")
Cc: Elvira Khabirova <lineprinter@altlinux.org>
Cc: stable@vger.kernel.org # v2.6.28+
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
4 years agos390/qdio: warn about unexpected SLSB states
Julian Wiedmann [Tue, 2 Jun 2020 12:26:36 +0000 (14:26 +0200)]
s390/qdio: warn about unexpected SLSB states

The way we produce SBALs to the device (first update q->nr_buf_used,
then update the SLSB) should ensure that we never see some of the
SLSB states when scanning the queue for progress.
So make some noise if we do, this implies a bug in our SBAL tracking.

Also tweak the WARN msg to provide more information.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
4 years agos390/qdio: clean up usage of qdio_data
Julian Wiedmann [Tue, 2 Jun 2020 12:23:32 +0000 (14:23 +0200)]
s390/qdio: clean up usage of qdio_data

This removes the last remaining accesses to ->qdio_data from internal
code. Just pass the qdio_irq struct where needed instead.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
4 years agoio_uring: acquire 'mm' for task_work for SQPOLL
Jens Axboe [Wed, 17 Jun 2020 00:42:49 +0000 (18:42 -0600)]
io_uring: acquire 'mm' for task_work for SQPOLL

If we're unlucky with timing, we could be running task_work after
having dropped the memory context in the sq thread. Since dropping
the context requires a runnable task state, we cannot reliably drop
it as part of our check-for-work loop in io_sq_thread(). Instead,
abstract out the mm acquire for the sq thread into a helper, and call
it from the async task work handler.

Cc: stable@vger.kernel.org # v5.7
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoio_uring: add memory barrier to synchronize io_kiocb's result and iopoll_completed
Xiaoguang Wang [Mon, 15 Jun 2020 18:06:38 +0000 (02:06 +0800)]
io_uring: add memory barrier to synchronize io_kiocb's result and iopoll_completed

In io_complete_rw_iopoll(), stores to io_kiocb's result and iopoll
completed are two independent store operations, to ensure that once
iopoll_completed is ture and then req->result must been perceived by
the cpu executing io_do_iopoll(), proper memory barrier should be used.

And in io_do_iopoll(), we check whether req->result is EAGAIN, if it is,
we'll need to issue this io request using io-wq again. In order to just
issue a single smp_rmb() on the completion side, move the re-submit work
to io_iopoll_complete().

Cc: stable@vger.kernel.org
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
[axboe: don't set ->iopoll_completed for -EAGAIN retry]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoio_uring: don't fail links for EAGAIN error in IOPOLL mode
Xiaoguang Wang [Mon, 15 Jun 2020 18:06:37 +0000 (02:06 +0800)]
io_uring: don't fail links for EAGAIN error in IOPOLL mode

In IOPOLL mode, for EAGAIN error, we'll try to submit io request
again using io-wq, so don't fail rest of links if this io request
has links.

Cc: stable@vger.kernel.org
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoMerge tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping
Linus Torvalds [Wed, 17 Jun 2020 18:29:37 +0000 (11:29 -0700)]
Merge tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:
 "Fixes for the SEV atomic pool (Geert Uytterhoeven and David Rientjes)"

* tag 'dma-mapping-5.8-3' of git://git.infradead.org/users/hch/dma-mapping:
  dma-pool: decouple DMA_REMAP from DMA_COHERENT_POOL
  dma-pool: fix too large DMA pools on medium memory size systems

4 years agomaccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault
Christoph Hellwig [Wed, 17 Jun 2020 07:37:54 +0000 (09:37 +0200)]
maccess: rename probe_user_{read,write} to copy_{from,to}_user_nofault

Better describe what these functions do.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agomaccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
Christoph Hellwig [Wed, 17 Jun 2020 07:37:53 +0000 (09:37 +0200)]
maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault

Better describe what these functions do.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agotools headers UAPI: Sync linux/fs.h with the kernel sources
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 13:23:51 +0000 (10:23 -0300)]
tools headers UAPI: Sync linux/fs.h with the kernel sources

To pick the changes from:

  b383a73f2b83 ("fs/ext4: Introduce DAX inode flag")

And silence this perf build warning:

  Warning: Kernel ABI header at 'tools/include/uapi/linux/fs.h' differs from latest version at 'include/uapi/linux/fs.h'
  diff -u tools/include/uapi/linux/fs.h include/uapi/linux/fs.h

It causes various beautifiers for things like fspick, fsmount, etc (see
below) to get rebuilt, but this specific change doesn't make 'perf
trace' be capable of decoding anything new, as we still don't decode
what comes from ioctls, just its cmds.

Details about the update:

  $ cp include/uapi/linux/fs.h tools/include/uapi/linux/fs.h
  $ git diff
  diff --git a/tools/include/uapi/linux/fs.h b/tools/include/uapi/linux/fs.h
  index 379a612f8f1d..f44eb0a04afd 100644
  --- a/tools/include/uapi/linux/fs.h
  +++ b/tools/include/uapi/linux/fs.h
  @@ -262,6 +262,7 @@ struct fsxattr {
   #define FS_EA_INODE_FL                 0x00200000 /* Inode used for large EA */
   #define FS_EOFBLOCKS_FL                        0x00400000 /* Reserved for ext4 */
   #define FS_NOCOW_FL                    0x00800000 /* Do not cow file */
  +#define FS_DAX_FL                      0x02000000 /* Inode is DAX */
   #define FS_INLINE_DATA_FL              0x10000000 /* Reserved for ext4 */
   #define FS_PROJINHERIT_FL              0x20000000 /* Create with parents projid */
   #define FS_CASEFOLD_FL                 0x40000000 /* Folder is case insensitive */
  $ m
  make: Entering directory '/home/acme/git/perf/tools/perf'
    BUILD:   Doing 'make -j8' parallel build
    INSTALL  GTK UI
    CC       /tmp/build/perf/builtin-trace.o
    DESCEND  plugins
    CC       /tmp/build/perf/trace/beauty/fsmount.o
    CC       /tmp/build/perf/trace/beauty/fspick.o
    CC       /tmp/build/perf/trace/beauty/mount_flags.o
    CC       /tmp/build/perf/trace/beauty/move_mount.o
    CC       /tmp/build/perf/trace/beauty/renameat.o
    CC       /tmp/build/perf/trace/beauty/sync_file_range.o
    INSTALL  trace_plugins
    LD       /tmp/build/perf/trace/beauty/perf-in.o
    LD       /tmp/build/perf/perf-in.o
    LINK     /tmp/build/perf/perf
  <SNIP>

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agotools include UAPI: Sync linux/vhost.h with the kernel sources
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 13:16:53 +0000 (10:16 -0300)]
tools include UAPI: Sync linux/vhost.h with the kernel sources

To get the changes in:

  776f395004d8 ("vhost_vdpa: Support config interrupt in vdpa")

Silencing this perf build warning:

  Warning: Kernel ABI header at 'tools/include/uapi/linux/vhost.h' differs from latest version at 'include/uapi/linux/vhost.h'
  diff -u tools/include/uapi/linux/vhost.h include/uapi/linux/vhost.h

This automatically picks the new ioctl introduced in the above patch,
making tools such as 'perf trace' aware of them and possibly allowing to
use the strings in filters, etc:

  # perf trace -e ioctl --pid 7951
  <SNIP>
     0.178 ( 0.010 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
     0.194 ( 0.010 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
     0.209 ( 0.010 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
     0.224 (249.413 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.660 ( 0.011 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.675 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.686 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.697 ( 0.008 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.709 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.720 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.730 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.740 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.752 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.762 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.772 ( 0.007 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   249.782 (120.138 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   370.201 ( 0.039 ms): CPU 0/KVM/8023 ioctl(fd: 12, cmd: KVM_IRQ_LINE_STATUS, arg: 0x7f744f9e1420) = 0
   370.254 ( 0.052 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   370.575 ( 0.365 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   370.973 ( 0.028 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   371.015 ( 0.037 ms): CPU 0/KVM/8023 ioctl(fd: 14, cmd: KVM_RUN) = 0
   371.071 ( 0.009 ms): CPU 0/KVM/8023 ioctl(fd: 12, cmd: KVM_IRQ_LINE_STATUS, arg: 0x7f744f9e14b0) = 0
  <SNIP>
  #

Details about the update:

  $ diff -u tools/include/uapi/linux/vhost.h include/uapi/linux/vhost.h
  --- tools/include/uapi/linux/vhost.h 2020-04-16 13:19:12.056763843 -0300
  +++ include/uapi/linux/vhost.h 2020-06-17 10:04:20.532056428 -0300
  @@ -15,6 +15,8 @@
   #include <linux/types.h>
   #include <linux/ioctl.h>

  +#define VHOST_FILE_UNBIND -1
  +
   /* ioctls */

   #define VHOST_VIRTIO 0xAF
  @@ -140,4 +142,6 @@
   /* Get the max ring size. */
   #define VHOST_VDPA_GET_VRING_NUM _IOR(VHOST_VIRTIO, 0x76, __u16)

  +/* Set event fd for config interrupt*/
  +#define VHOST_VDPA_SET_CONFIG_CALL _IOW(VHOST_VIRTIO, 0x77, int)
   #endif
  $
  $ tools/perf/trace/beauty/vhost_virtio_ioctl.sh > before
  $ cp include/uapi/linux/vhost.h tools/include/uapi/linux/vhost.h
  $ tools/perf/trace/beauty/vhost_virtio_ioctl.sh > after
  $ diff -u before after
  --- before 2020-06-17 10:15:35.123275966 -0300
  +++ after 2020-06-17 10:15:51.812482117 -0300
  @@ -27,6 +27,7 @@
    [0x72] = "VDPA_SET_STATUS",
    [0x74] = "VDPA_SET_CONFIG",
    [0x75] = "VDPA_SET_VRING_ENABLE",
  + [0x77] = "VDPA_SET_CONFIG_CALL",
   };
   static const char *vhost_virtio_ioctl_read_cmds[] = {
    [0x00] = "GET_FEATURES",
  $

This causes these parts to get rebuilt:

  CC       /tmp/build/perf/trace/beauty/ioctl.o
  INSTALL  trace_plugins
  LD       /tmp/build/perf/trace/beauty/perf-in.o
  LD       /tmp/build/perf/perf-in.o
  LINK     /tmp/build/perf/perf

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zhu Lingshan <lingshan.zhu@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agotools arch x86: Sync the msr-index.h copy with the kernel sources
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 13:07:59 +0000 (10:07 -0300)]
tools arch x86: Sync the msr-index.h copy with the kernel sources

To pick up the changes in:

  7e5b3c267d25 ("x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation")

Addressing these tools/perf build warnings:

  Warning: Kernel ABI header at 'tools/arch/x86/include/asm/msr-index.h' differs from latest version at 'arch/x86/include/asm/msr-index.h'
  diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
  Warning: Kernel ABI header at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h'
  diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h

With this one will be able to use these new AMD MSRs in filters, by
name, e.g.:

  # perf trace -e msr:* --filter "msr==IA32_MCU_OPT_CTRL"
  ^C#

Using -v we can see how it sets up the tracepoint filters, converting
from the string in the filter to the numeric value:

  # perf trace -v -e msr:* --filter "msr==IA32_MCU_OPT_CTRL"
  Using CPUID GenuineIntel-6-8E-A
  0x123
  New filter for msr:read_msr: (msr==0x123) && (common_pid != 335 && common_pid != 30344)
  0x123
  New filter for msr:write_msr: (msr==0x123) && (common_pid != 335 && common_pid != 30344)
  0x123
  New filter for msr:rdpmc: (msr==0x123) && (common_pid != 335 && common_pid != 30344)
  mmap size 528384B
  ^C#

The updating process shows how this affects tooling in more detail:

  $ diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
  --- tools/arch/x86/include/asm/msr-index.h 2020-06-03 10:36:09.959910238 -0300
  +++ arch/x86/include/asm/msr-index.h 2020-06-17 10:04:20.235052901 -0300
  @@ -128,6 +128,10 @@
   #define TSX_CTRL_RTM_DISABLE BIT(0) /* Disable RTM feature */
   #define TSX_CTRL_CPUID_CLEAR BIT(1) /* Disable TSX enumeration */

  +/* SRBDS support */
  +#define MSR_IA32_MCU_OPT_CTRL 0x00000123
  +#define RNGDS_MITG_DIS BIT(0)
  +
   #define MSR_IA32_SYSENTER_CS 0x00000174
   #define MSR_IA32_SYSENTER_ESP 0x00000175
   #define MSR_IA32_SYSENTER_EIP 0x00000176
  $ set -o vi
  $ tools/perf/trace/beauty/tracepoints/x86_msr.sh > before
  $ cp arch/x86/include/asm/msr-index.h tools/arch/x86/include/asm/msr-index.h
  $ tools/perf/trace/beauty/tracepoints/x86_msr.sh > after
  $ diff -u before after
  --- before 2020-06-17 10:05:49.653114752 -0300
  +++ after 2020-06-17 10:06:01.777258731 -0300
  @@ -51,6 +51,7 @@
    [0x0000011e] = "IA32_BBL_CR_CTL3",
    [0x00000120] = "IDT_MCR_CTRL",
    [0x00000122] = "IA32_TSX_CTRL",
  + [0x00000123] = "IA32_MCU_OPT_CTRL",
    [0x00000140] = "MISC_FEATURES_ENABLES",
    [0x00000174] = "IA32_SYSENTER_CS",
    [0x00000175] = "IA32_SYSENTER_ESP",
  $

The related change to cpu-features.h affects this:

  CC       /tmp/build/perf/bench/mem-memcpy-x86-64-asm.o
  CC       /tmp/build/perf/bench/mem-memset-x86-64-asm.o

This shouldn't be affecting that 'perf bench' entry:

  $ find tools/perf/ -type f | xargs grep SRBDS
  $

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Gross <mgross@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agoMerge remote-tracking branch 'torvalds/master' into perf/urgent
Arnaldo Carvalho de Melo [Wed, 17 Jun 2020 16:20:14 +0000 (13:20 -0300)]
Merge remote-tracking branch 'torvalds/master' into perf/urgent

To get some newer headers that got out of sync with the copies in tools/
so that we can try to have the tools/perf/ build clean for v5.8 with
fewer pull requests.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agoperf script: Initialize zstd_data
Milian Wolff [Fri, 12 Jun 2020 23:03:33 +0000 (01:03 +0200)]
perf script: Initialize zstd_data

Fixes segmentation fault when trying to interpret zstd-compressed data
with perf script:

```
  $ perf record -z ls
  ...
  [ perf record: Captured and wrote 0,010 MB perf.data, compressed (original 0,001 MB, ratio is 2,190) ]
  $ memcheck perf script
  ...
  ==67911== Invalid read of size 4
  ==67911==    at 0x5568188: ZSTD_decompressStream (in /usr/lib/libzstd.so.1.4.5)
  ==67911==    by 0x6E726B: zstd_decompress_stream (zstd.c:100)
  ==67911==    by 0x65729C: perf_session__process_compressed_event (session.c:72)
  ==67911==    by 0x6598E8: perf_session__process_user_event (session.c:1583)
  ==67911==    by 0x65BA59: reader__process_events (session.c:2177)
  ==67911==    by 0x65BA59: __perf_session__process_events (session.c:2234)
  ==67911==    by 0x65BA59: perf_session__process_events (session.c:2267)
  ==67911==    by 0x5A7397: __cmd_script (builtin-script.c:2447)
  ==67911==    by 0x5A7397: cmd_script (builtin-script.c:3840)
  ==67911==    by 0x5FE9D2: run_builtin (perf.c:312)
  ==67911==    by 0x711627: handle_internal_command (perf.c:364)
  ==67911==    by 0x711627: run_argv (perf.c:408)
  ==67911==    by 0x711627: main (perf.c:538)
  ==67911==  Address 0x71d8 is not stack'd, malloc'd or (recently) free'd
```

Signed-off-by: Milian Wolff <milian.wolff@kdab.com>
Acked-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
LPU-Reference: 20200612230333.72140-1-milian.wolff@kdab.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
4 years agoblktrace: Avoid sparse warnings when assigning q->blk_trace
Jan Kara [Fri, 5 Jun 2020 14:58:37 +0000 (16:58 +0200)]
blktrace: Avoid sparse warnings when assigning q->blk_trace

Mostly for historical reasons, q->blk_trace is assigned through xchg()
and cmpxchg() atomic operations. Although this is correct, sparse
complains about this because it violates rcu annotations since commit
c780e86dd48e ("blktrace: Protect q->blk_trace with RCU") which started
to use rcu for accessing q->blk_trace. Furthermore there's no real need
for atomic operations anymore since all changes to q->blk_trace happen
under q->blk_trace_mutex and since it also makes more sense to check if
q->blk_trace is set with the mutex held earlier.

So let's just replace xchg() with rcu_replace_pointer() and cmpxchg()
with explicit check and rcu_assign_pointer(). This makes the code more
efficient and sparse happy.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoblktrace: break out of blktrace setup on concurrent calls
Luis Chamberlain [Fri, 5 Jun 2020 14:58:36 +0000 (16:58 +0200)]
blktrace: break out of blktrace setup on concurrent calls

We use one blktrace per request_queue, that means one per the entire
disk.  So we cannot run one blktrace on say /dev/vda and then /dev/vda1,
or just two calls on /dev/vda.

We check for concurrent setup only at the very end of the blktrace setup though.

If we try to run two concurrent blktraces on the same block device the
second one will fail, and the first one seems to go on. However when
one tries to kill the first one one will see things like this:

The kernel will show these:

```
debugfs: File 'dropped' in directory 'nvme1n1' already present!
debugfs: File 'msg' in directory 'nvme1n1' already present!
debugfs: File 'trace0' in directory 'nvme1n1' already present!
``

And userspace just sees this error message for the second call:

```
blktrace /dev/nvme1n1
BLKTRACESETUP(2) /dev/nvme1n1 failed: 5/Input/output error
```

The first userspace process #1 will also claim that the files
were taken underneath their nose as well. The files are taken
away form the first process given that when the second blktrace
fails, it will follow up with a BLKTRACESTOP and BLKTRACETEARDOWN.
This means that even if go-happy process #1 is waiting for blktrace
data, we *have* been asked to take teardown the blktrace.

This can easily be reproduced with break-blktrace [0] run_0005.sh test.

Just break out early if we know we're already going to fail, this will
prevent trying to create the files all over again, which we know still
exist.

[0] https://github.com/mcgrof/break-blktrace

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
4 years agoarm64: bti: Require clang >= 10.0.1 for in-kernel BTI support
Will Deacon [Tue, 16 Jun 2020 18:03:49 +0000 (19:03 +0100)]
arm64: bti: Require clang >= 10.0.1 for in-kernel BTI support

Unfortunately, most versions of clang that support BTI are capable of
miscompiling the kernel when converting a switch statement into a jump
table. As an example, attempting to spawn a KVM guest results in a panic:

[   56.253312] Kernel panic - not syncing: bad mode
[   56.253834] CPU: 0 PID: 279 Comm: lkvm Not tainted 5.8.0-rc1 #2
[   56.254225] Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
[   56.254712] Call trace:
[   56.254952]  dump_backtrace+0x0/0x1d4
[   56.255305]  show_stack+0x1c/0x28
[   56.255647]  dump_stack+0xc4/0x128
[   56.255905]  panic+0x16c/0x35c
[   56.256146]  bad_el0_sync+0x0/0x58
[   56.256403]  el1_sync_handler+0xb4/0xe0
[   56.256674]  el1_sync+0x7c/0x100
[   56.256928]  kvm_vm_ioctl_check_extension_generic+0x74/0x98
[   56.257286]  __arm64_sys_ioctl+0x94/0xcc
[   56.257569]  el0_svc_common+0x9c/0x150
[   56.257836]  do_el0_svc+0x84/0x90
[   56.258083]  el0_sync_handler+0xf8/0x298
[   56.258361]  el0_sync+0x158/0x180

This is because the switch in kvm_vm_ioctl_check_extension_generic()
is executed as an indirect branch to tail-call through a jump table:

ffff800010032dc8:       3869694c        ldrb    w12, [x10, x9]
ffff800010032dcc:       8b0c096b        add     x11, x11, x12, lsl #2
ffff800010032dd0:       d61f0160        br      x11

However, where the target case uses the stack, the landing pad is elided
due to the presence of a paciasp instruction:

ffff800010032e14:       d503233f        paciasp
ffff800010032e18:       a9bf7bfd        stp     x29, x30, [sp, #-16]!
ffff800010032e1c:       910003fd        mov     x29, sp
ffff800010032e20:       aa0803e0        mov     x0, x8
ffff800010032e24:       940017c0        bl      ffff800010038d24 <kvm_vm_ioctl_check_extension>
ffff800010032e28:       93407c00        sxtw    x0, w0
ffff800010032e2c:       a8c17bfd        ldp     x29, x30, [sp], #16
ffff800010032e30:       d50323bf        autiasp
ffff800010032e34:       d65f03c0        ret

Unfortunately, this results in a fatal exception because paciasp is
compatible only with branch-and-link (call) instructions and not simple
indirect branches.

A fix is being merged into Clang 10.0.1 so that a 'bti j' instruction is
emitted as an explicit landing pad in this situation. Make in-kernel
BTI depend on that compiler version when building with clang.

Cc: Tom Stellard <tstellar@redhat.com>
Cc: Daniel Kiss <daniel.kiss@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20200615105524.GA2694@willie-the-truck
Link: https://lore.kernel.org/r/20200616183630.2445-1-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
4 years agooverflow.h: Add flex_array_size() helper
Gustavo A. R. Silva [Tue, 9 Jun 2020 01:22:33 +0000 (20:22 -0500)]
overflow.h: Add flex_array_size() helper

Add flex_array_size() helper for the calculation of the size, in bytes,
of a flexible array member contained within an enclosing structure.

Example of usage:

struct something {
size_t count;
struct foo items[];
};

struct something *instance;

instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
instance->count = count;
memcpy(instance->items, src, flex_array_size(instance, items, instance->count));

The helper returns SIZE_MAX on overflow instead of wrapping around.

Additionally replaces parameter "n" with "count" in struct_size() helper
for greater clarity and unification.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200609012233.GA3371@embeddedor
Signed-off-by: Kees Cook <keescook@chromium.org>
4 years agotools/bootconfig: Add testcase for show-command and quotes test
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:34 +0000 (19:14 +0900)]
tools/bootconfig: Add testcase for show-command and quotes test

Add testcases for the return value of the command to show
bootconfig in initrd, and double/single quotes selecting.

Link: http://lkml.kernel.org/r/159230247428.65555.2109472942519215104.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotools/bootconfig: Fix to return 0 if succeeded to show the bootconfig
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:25 +0000 (19:14 +0900)]
tools/bootconfig: Fix to return 0 if succeeded to show the bootconfig

Fix bootconfig to return 0 if succeeded to show the bootconfig
in initrd. Without this fix, "bootconfig INITRD" command
returns !0 even if the command succeeded to show the bootconfig.

Link: http://lkml.kernel.org/r/159230246566.65555.11891772258543514487.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: 950313ebf79c ("tools: bootconfig: Add bootconfig command")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotools/bootconfig: Fix to use correct quotes for value
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:17 +0000 (19:14 +0900)]
tools/bootconfig: Fix to use correct quotes for value

Fix bootconfig tool to select double or single quotes
correctly according to the value.

If a bootconfig value includes a double quote character,
we must use single-quotes to quote that value.

Link: http://lkml.kernel.org/r/159230245697.65555.12444299015852932304.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: 950313ebf79c ("tools: bootconfig: Add bootconfig command")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoproc/bootconfig: Fix to use correct quotes for value
Masami Hiramatsu [Tue, 16 Jun 2020 10:14:08 +0000 (19:14 +0900)]
proc/bootconfig: Fix to use correct quotes for value

Fix /proc/bootconfig to select double or single quotes
corrctly according to the value.

If a bootconfig value includes a double quote character,
we must use single-quotes to quote that value.

This modifies if() condition and blocks for avoiding
double-quote in value check in 2 places. Anyway, since
xbc_array_for_each_value() can handle the array which
has a single node correctly.
Thus,

if (vnode && xbc_node_is_array(vnode)) {
xbc_array_for_each_value(vnode) /* vnode->next != NULL */
...
} else {
snprintf(val); /* val is an empty string if !vnode */
}

is equivalent to

if (vnode) {
xbc_array_for_each_value(vnode) /* vnode->next can be NULL */
...
} else {
snprintf(""); /* value is always empty */
}

Link: http://lkml.kernel.org/r/159230244786.65555.3763894451251622488.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: c1a3c36017d4 ("proc: bootconfig: Add /proc/bootconfig to show boot config list")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Remove unused event variable in tracing_iter_reset
YangHui [Tue, 16 Jun 2020 03:36:46 +0000 (11:36 +0800)]
tracing: Remove unused event variable in tracing_iter_reset

We do not use the event variable, just remove it.

Signed-off-by: YangHui <yanghui.def@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing/probe: Fix memleak in fetch_op_data operations
Vamshi K Sthambamkadi [Mon, 15 Jun 2020 14:30:38 +0000 (20:00 +0530)]
tracing/probe: Fix memleak in fetch_op_data operations

kmemleak report:
    [<57dcc2ca>] __kmalloc_track_caller+0x139/0x2b0
    [<f1c45d0f>] kstrndup+0x37/0x80
    [<f9761eb0>] parse_probe_arg.isra.7+0x3cc/0x630
    [<055bf2ba>] traceprobe_parse_probe_arg+0x2f5/0x810
    [<655a7766>] trace_kprobe_create+0x2ca/0x950
    [<4fc6a02a>] create_or_delete_trace_kprobe+0xf/0x30
    [<6d1c8a52>] trace_run_command+0x67/0x80
    [<be812cc0>] trace_parse_run_command+0xa7/0x140
    [<aecfe401>] probes_write+0x10/0x20
    [<2027641c>] __vfs_write+0x30/0x1e0
    [<6a4aeee1>] vfs_write+0x96/0x1b0
    [<3517fb7d>] ksys_write+0x53/0xc0
    [<dad91db7>] __ia32_sys_write+0x15/0x20
    [<da347f64>] do_syscall_32_irqs_on+0x3d/0x260
    [<fd0b7e7d>] do_fast_syscall_32+0x39/0xb0
    [<ea5ae810>] entry_SYSENTER_32+0xaf/0x102

Post parse_probe_arg(), the FETCH_OP_DATA operation type is overwritten
to FETCH_OP_ST_STRING, as a result memory is never freed since
traceprobe_free_probe_arg() iterates only over SYMBOL and DATA op types

Setup fetch string operation correctly after fetch_op_data operation.

Link: https://lkml.kernel.org/r/20200615143034.GA1734@cosmos
Cc: stable@vger.kernel.org
Fixes: a42e3c4de964 ("tracing/probe: Add immediate string parameter support")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotrace: Fix typo in allocate_ftrace_ops()'s comment
Wei Yang [Wed, 10 Jun 2020 03:32:51 +0000 (11:32 +0800)]
trace: Fix typo in allocate_ftrace_ops()'s comment

No functional change, just correct the word.

Link: https://lkml.kernel.org/r/20200610033251.31713-1-richard.weiyang@linux.alibaba.com
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agotracing: Make ftrace packed events have align of 1
Steven Rostedt (VMware) [Wed, 10 Jun 2020 02:00:41 +0000 (22:00 -0400)]
tracing: Make ftrace packed events have align of 1

When using trace-cmd on 5.6-rt for the function graph tracer, the output was
corrupted. It gave output like this:

 funcgraph_entry:       func=0xffffffff depth=38982
 funcgraph_entry:       func=0x1ffffffff depth=16044
 funcgraph_exit:        func=0xffffffff overrun=0x92539aaf00000000 calltime=0x92539c9900000072 rettime=0x100000072 depth=11084
 funcgraph_exit:        func=0xffffffff overrun=0x9253946e00000000 calltime=0x92539e2100000072 rettime=0x72 depth=26033702
 funcgraph_entry:       func=0xffffffff depth=85798
 funcgraph_entry:       func=0x1ffffffff depth=12044

The reason was because the tracefs/events/ftrace/funcgraph_entry/exit format
file was incorrect. The -rt kernel adds more common fields to the trace
events. Namely, common_migrate_disable and common_preempt_lazy_count. Each
is one byte in size. This changes the alignment of the normal payload. Most
events are aligned normally, but the function and function graph events are
defined with a "PACKED" macro, that packs their payload. As the offsets
displayed in the format files are now calculated by an aligned field, the
aligned field for function and function graph events should be 1, not their
normal alignment.

With aligning of the funcgraph_entry event, the format file has:

        field:unsigned short common_type;       offset:0;       size:2; signed:0;
        field:unsigned char common_flags;       offset:2;       size:1; signed:0;
        field:unsigned char common_preempt_count;       offset:3;       size:1; signed:0;
        field:int common_pid;   offset:4;       size:4; signed:1;
        field:unsigned char common_migrate_disable;     offset:8;       size:1; signed:0;
        field:unsigned char common_preempt_lazy_count;  offset:9;       size:1; signed:0;

        field:unsigned long func;       offset:16;      size:8; signed:0;
        field:int depth;        offset:24;      size:4; signed:1;

But the actual alignment is:

field:unsigned short common_type; offset:0; size:2; signed:0;
field:unsigned char common_flags; offset:2; size:1; signed:0;
field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
field:int common_pid; offset:4; size:4; signed:1;
field:unsigned char common_migrate_disable; offset:8; size:1; signed:0;
field:unsigned char common_preempt_lazy_count; offset:9; size:1; signed:0;

field:unsigned long func; offset:12; size:8; signed:0;
field:int depth; offset:20; size:4; signed:1;

Link: https://lkml.kernel.org/r/20200609220041.2a3b527f@oasis.local.home
Cc: stable@vger.kernel.org
Fixes: 04ae87a52074e ("ftrace: Rework event_create_dir()")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agosample-trace-array: Remove trace_array 'sample-instance'
Kefeng Wang [Tue, 9 Jun 2020 13:52:00 +0000 (13:52 +0000)]
sample-trace-array: Remove trace_array 'sample-instance'

Remove trace_array 'sample-instance' if kthread_run fails
in sample_trace_array_init().

Link: https://lkml.kernel.org/r/20200609135200.2206726-1-wangkefeng.wang@huawei.com
Cc: stable@vger.kernel.org
Fixes: 89ed42495ef4a ("tracing: Sample module to demonstrate kernel access to Ftrace instances.")
Reviewed-by: Divya Indi <divya.indi@oracle.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agosample-trace-array: Fix sleeping function called from invalid context
Kefeng Wang [Wed, 10 Jun 2020 01:12:44 +0000 (01:12 +0000)]
sample-trace-array: Fix sleeping function called from invalid context

BUG: sleeping function called from invalid context at kernel/locking/mutex.c:935
 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/5
 1 lock held by swapper/5/0:
  #0: ffff80001002bd90 (samples/ftrace/sample-trace-array.c:38){+.-.}-{0:0}, at: call_timer_fn+0x8/0x3e0
 CPU: 5 PID: 0 Comm: swapper/5 Not tainted 5.7.0+ #8
 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
 Call trace:
  dump_backtrace+0x0/0x1a0
  show_stack+0x20/0x30
  dump_stack+0xe4/0x150
  ___might_sleep+0x160/0x200
  __might_sleep+0x58/0x90
  __mutex_lock+0x64/0x948
  mutex_lock_nested+0x3c/0x58
  __ftrace_set_clr_event+0x44/0x88
  trace_array_set_clr_event+0x24/0x38
  mytimer_handler+0x34/0x40 [sample_trace_array]

mutex_lock() will be called in interrupt context, using workqueue to fix it.

Link: https://lkml.kernel.org/r/20200610011244.2209486-1-wangkefeng.wang@huawei.com
Cc: stable@vger.kernel.org
Fixes: 89ed42495ef4 ("tracing: Sample module to demonstrate kernel access to Ftrace instances.")
Reviewed-by: Divya Indi <divya.indi@oracle.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokretprobe: Prevent triggering kretprobe from within kprobe_flush_task
Jiri Olsa [Tue, 12 May 2020 08:03:18 +0000 (17:03 +0900)]
kretprobe: Prevent triggering kretprobe from within kprobe_flush_task

Ziqian reported lockup when adding retprobe on _raw_spin_lock_irqsave.
My test was also able to trigger lockdep output:

 ============================================
 WARNING: possible recursive locking detected
 5.6.0-rc6+ #6 Not tainted
 --------------------------------------------
 sched-messaging/2767 is trying to acquire lock:
 ffffffff9a492798 (&(kretprobe_table_locks[i].lock)){-.-.}, at: kretprobe_hash_lock+0x52/0xa0

 but task is already holding lock:
 ffffffff9a491a18 (&(kretprobe_table_locks[i].lock)){-.-.}, at: kretprobe_trampoline+0x0/0x50

 other info that might help us debug this:
  Possible unsafe locking scenario:

        CPU0
        ----
   lock(&(kretprobe_table_locks[i].lock));
   lock(&(kretprobe_table_locks[i].lock));

  *** DEADLOCK ***

  May be due to missing lock nesting notation

 1 lock held by sched-messaging/2767:
  #0: ffffffff9a491a18 (&(kretprobe_table_locks[i].lock)){-.-.}, at: kretprobe_trampoline+0x0/0x50

 stack backtrace:
 CPU: 3 PID: 2767 Comm: sched-messaging Not tainted 5.6.0-rc6+ #6
 Call Trace:
  dump_stack+0x96/0xe0
  __lock_acquire.cold.57+0x173/0x2b7
  ? native_queued_spin_lock_slowpath+0x42b/0x9e0
  ? lockdep_hardirqs_on+0x590/0x590
  ? __lock_acquire+0xf63/0x4030
  lock_acquire+0x15a/0x3d0
  ? kretprobe_hash_lock+0x52/0xa0
  _raw_spin_lock_irqsave+0x36/0x70
  ? kretprobe_hash_lock+0x52/0xa0
  kretprobe_hash_lock+0x52/0xa0
  trampoline_handler+0xf8/0x940
  ? kprobe_fault_handler+0x380/0x380
  ? find_held_lock+0x3a/0x1c0
  kretprobe_trampoline+0x25/0x50
  ? lock_acquired+0x392/0xbc0
  ? _raw_spin_lock_irqsave+0x50/0x70
  ? __get_valid_kprobe+0x1f0/0x1f0
  ? _raw_spin_unlock_irqrestore+0x3b/0x40
  ? finish_task_switch+0x4b9/0x6d0
  ? __switch_to_asm+0x34/0x70
  ? __switch_to_asm+0x40/0x70

The code within the kretprobe handler checks for probe reentrancy,
so we won't trigger any _raw_spin_lock_irqsave probe in there.

The problem is in outside kprobe_flush_task, where we call:

  kprobe_flush_task
    kretprobe_table_lock
      raw_spin_lock_irqsave
        _raw_spin_lock_irqsave

where _raw_spin_lock_irqsave triggers the kretprobe and installs
kretprobe_trampoline handler on _raw_spin_lock_irqsave return.

The kretprobe_trampoline handler is then executed with already
locked kretprobe_table_locks, and first thing it does is to
lock kretprobe_table_locks ;-) the whole lockup path like:

  kprobe_flush_task
    kretprobe_table_lock
      raw_spin_lock_irqsave
        _raw_spin_lock_irqsave ---> probe triggered, kretprobe_trampoline installed

        ---> kretprobe_table_locks locked

        kretprobe_trampoline
          trampoline_handler
            kretprobe_hash_lock(current, &head, &flags);  <--- deadlock

Adding kprobe_busy_begin/end helpers that mark code with fake
probe installed to prevent triggering of another kprobe within
this code.

Using these helpers in kprobe_flush_task, so the probe recursion
protection check is hit and the probe is never set to prevent
above lockup.

Link: http://lkml.kernel.org/r/158927059835.27680.7011202830041561604.stgit@devnote2
Fixes: ef53d9c5e4da ("kprobes: improve kretprobe scalability with hashed locking")
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "Gustavo A . R . Silva" <gustavoars@kernel.org>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: "Naveen N . Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Reported-by: "Ziqian SUN (Zamir)" <zsun@redhat.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Remove redundant arch_disarm_kprobe() call
Masami Hiramatsu [Tue, 12 May 2020 08:03:07 +0000 (17:03 +0900)]
kprobes: Remove redundant arch_disarm_kprobe() call

Fix to remove redundant arch_disarm_kprobe() call in
force_unoptimize_kprobe(). This arch_disarm_kprobe()
will be invoked if the kprobe is optimized but disabled,
but that means the kprobe (optprobe) is unused (and
unoptimized) state.

In that case, unoptimize_kprobe() puts it in freeing_list
and kprobe_optimizer (do_unoptimize_kprobes()) automatically
disarm it. Thus this arch_disarm_kprobe() is redundant.

Link: http://lkml.kernel.org/r/158927058719.27680.17183632908465341189.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Fix to protect kick_kprobe_optimizer() by kprobe_mutex
Masami Hiramatsu [Tue, 12 May 2020 08:02:56 +0000 (17:02 +0900)]
kprobes: Fix to protect kick_kprobe_optimizer() by kprobe_mutex

In kprobe_optimizer() kick_kprobe_optimizer() is called
without kprobe_mutex, but this can race with other caller
which is protected by kprobe_mutex.

To fix that, expand kprobe_mutex protected area to protect
kick_kprobe_optimizer() call.

Link: http://lkml.kernel.org/r/158927057586.27680.5036330063955940456.stgit@devnote2
Fixes: cd7ebe2298ff ("kprobes: Use text_poke_smp_batch for optimizing")
Cc: Ingo Molnar <mingo@kernel.org>
Cc: "Gustavo A . R . Silva" <gustavoars@kernel.org>
Cc: Anders Roxell <anders.roxell@linaro.org>
Cc: "Naveen N . Rao" <naveen.n.rao@linux.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ziqian SUN <zsun@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Use non RCU traversal APIs on kprobe_tables if possible
Masami Hiramatsu [Tue, 12 May 2020 08:02:44 +0000 (17:02 +0900)]
kprobes: Use non RCU traversal APIs on kprobe_tables if possible

Current kprobes uses RCU traversal APIs on kprobe_tables
even if it is safe because kprobe_mutex is locked.

Make those traversals to non-RCU APIs where the kprobe_mutex
is locked.

Link: http://lkml.kernel.org/r/158927056452.27680.9710575332163005121.stgit@devnote2
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agokprobes: Suppress the suspicious RCU warning on kprobes
Masami Hiramatsu [Tue, 12 May 2020 08:02:33 +0000 (17:02 +0900)]
kprobes: Suppress the suspicious RCU warning on kprobes

Anders reported that the lockdep warns that suspicious
RCU list usage in register_kprobe() (detected by
CONFIG_PROVE_RCU_LIST.) This is because get_kprobe()
access kprobe_table[] by hlist_for_each_entry_rcu()
without rcu_read_lock.

If we call get_kprobe() from the breakpoint handler context,
it is run with preempt disabled, so this is not a problem.
But in other cases, instead of rcu_read_lock(), we locks
kprobe_mutex so that the kprobe_table[] is not updated.
So, current code is safe, but still not good from the view
point of RCU.

Joel suggested that we can silent that warning by passing
lockdep_is_held() to the last argument of
hlist_for_each_entry_rcu().

Add lockdep_is_held(&kprobe_mutex) at the end of the
hlist_for_each_entry_rcu() to suppress the warning.

Link: http://lkml.kernel.org/r/158927055350.27680.10261450713467997503.stgit@devnote2
Reported-by: Anders Roxell <anders.roxell@linaro.org>
Suggested-by: Joel Fernandes <joel@joelfernandes.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agorecordmcount: support >64k sections
Sami Tolvanen [Fri, 24 Apr 2020 19:30:46 +0000 (12:30 -0700)]
recordmcount: support >64k sections

When compiling a kernel with Clang and LTO, we need to run
recordmcount on vmlinux.o with a large number of sections, which
currently fails as the program doesn't understand extended
section indexes. This change adds support for processing binaries
with >64k sections.

Link: https://lkml.kernel.org/r/20200424193046.160744-1-samitolvanen@google.com
Link: https://lore.kernel.org/lkml/CAK7LNARbZhoaA=Nnuw0=gBrkuKbr_4Ng_Ei57uafujZf7Xazgw@mail.gmail.com/
Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Matt Helsley <mhelsley@vmware.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
4 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Linus Torvalds [Wed, 17 Jun 2020 00:44:54 +0000 (17:44 -0700)]
Merge git://git./linux/kernel/git/netdev/net

Pull networking fixes from David Miller:

 1) Don't get per-cpu pointer with preemption enabled in nft_set_pipapo,
    fix from Stefano Brivio.

 2) Fix memory leak in ctnetlink, from Pablo Neira Ayuso.

 3) Multiple definitions of MPTCP_PM_MAX_ADDR, from Geliang Tang.

 4) Accidently disabling NAPI in non-error paths of macb_open(), from
    Charles Keepax.

 5) Fix races between alx_stop and alx_remove, from Zekun Shen.

 6) We forget to re-enable SRIOV during resume in bnxt_en driver, from
    Michael Chan.

 7) Fix memory leak in ipv6_mc_destroy_dev(), from Wang Hai.

 8) rxtx stats use wrong index in mvpp2 driver, from Sven Auhagen.

 9) Fix memory leak in mptcp_subflow_create_socket error path, from Wei
    Yongjun.

10) We should not adjust the TCP window advertised when sending dup acks
    in non-SACK mode, because it won't be counted as a dup by the sender
    if the window size changes. From Eric Dumazet.

11) Destroy the right number of queues during remove in mvpp2 driver,
    from Sven Auhagen.

12) Various WOL and PM fixes to e1000 driver, from Chen Yu, Vaibhav
    Gupta, and Arnd Bergmann.

* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (35 commits)
  e1000e: fix unused-function warning
  e1000: use generic power management
  e1000e: Do not wake up the system via WOL if device wakeup is disabled
  lan743x: add MODULE_DEVICE_TABLE for module loading alias
  mlxsw: spectrum: Adjust headroom buffers for 8x ports
  bareudp: Fixed configuration to avoid having garbage values
  mvpp2: remove module bugfix
  tcp: grow window for OOO packets only for SACK flows
  mptcp: fix memory leak in mptcp_subflow_create_socket()
  netfilter: flowtable: Make nf_flow_table_offload_add/del_cb inline
  net/sched: act_ct: Make tcf_ct_flow_table_restore_skb inline
  net: dsa: sja1105: fix PTP timestamping with large tc-taprio cycles
  mvpp2: ethtool rxtx stats fix
  MAINTAINERS: switch to my private email for Renesas Ethernet drivers
  rocker: fix incorrect error handling in dma_rings_init
  test_objagg: Fix potential memory leak in error handling
  net: ethernet: mtk-star-emac: simplify interrupt handling
  mld: fix memory leak in ipv6_mc_destroy_dev()
  bnxt_en: Return from timer if interface is not in open state.
  bnxt_en: Fix AER reset logic on 57500 chips.
  ...

4 years agoMerge tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
Linus Torvalds [Wed, 17 Jun 2020 00:40:51 +0000 (17:40 -0700)]
Merge tag 'afs-fixes-20200616' of git://git./linux/kernel/git/dhowells/linux-fs

Pull AFS fixes from David Howells:
 "I've managed to get xfstests kind of working with afs. Here are a set
  of patches that fix most of the bugs found.

  There are a number of primary issues:

   - Incorrect handling of mtime and non-handling of ctime. It might be
     argued, that the latter isn't a bug since the AFS protocol doesn't
     support ctime, but I should probably still update it locally.

   - Shared-write mmap, truncate and writeback bugs. This includes not
     changing i_size under the callback lock, overwriting local i_size
     with the reply from the server after a partial writeback, not
     limiting the writeback from an mmapped page to EOF.

   - Checks for an abort code indicating that the primary vnode in an
     operation was deleted by a third-party are done in the wrong place.

   - Silly rename bugs. This includes an incomplete conversion to the
     new operation handling, duplicate nlink handling, nlink changing
     not being done inside the callback lock and insufficient handling
     of third-party conflicting directory changes.

  And some secondary ones:

   - The UAEOVERFLOW abort code should map to EOVERFLOW not EREMOTEIO.

   - Remove a couple of unused or incompletely used bits.

   - Remove a couple of redundant success checks.

  These seem to fix all the data-corruption bugs found by

./check -afs -g quick

  along with the obvious silly rename bugs and time bugs.

  There are still some test failures, but they seem to fall into two
  classes: firstly, the authentication/security model is different to
  the standard UNIX model and permission is arbitrated by the server and
  cached locally; and secondly, there are a number of features that AFS
  does not support (such as mknod). But in these cases, the tests
  themselves need to be adapted or skipped.

  Using the in-kernel afs client with xfstests also found a bug in the
  AuriStor AFS server that has been fixed for a future release"

* tag 'afs-fixes-20200616' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Fix silly rename
  afs: afs_vnode_commit_status() doesn't need to check the RPC error
  afs: Fix use of afs_check_for_remote_deletion()
  afs: Remove afs_operation::abort_code
  afs: Fix yfs_fs_fetch_status() to honour vnode selector
  afs: Remove yfs_fs_fetch_file_status() as it's not used
  afs: Fix the mapping of the UAEOVERFLOW abort code
  afs: Fix truncation issues and mmap writeback size
  afs: Concoct ctimes
  afs: Fix EOF corruption
  afs: afs_write_end() should change i_size under the right lock
  afs: Fix non-setting of mtime when writing into mmap

4 years agoDocumentation: remove SH-5 index entries
Randy Dunlap [Mon, 15 Jun 2020 02:59:07 +0000 (19:59 -0700)]
Documentation: remove SH-5 index entries

Remove SH-5 documentation index entries following the removal
of SH-5 source code.

Error: Cannot open file ../arch/sh/mm/tlb-sh5.c
Error: Cannot open file ../arch/sh/mm/tlb-sh5.c
Error: Cannot open file ../arch/sh/include/asm/tlb_64.h
Error: Cannot open file ../arch/sh/include/asm/tlb_64.h

Fixes: 3b69e8b45711 ("Merge tag 'sh-for-5.8' of git://git.libc.org/linux-sh")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Rich Felker <dalias@libc.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: ysato@users.sourceforge.jp
Cc: linux-sh@vger.kernel.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoMerge tag 'flex-array-conversions-5.8-rc2' of git://git.kernel.org/pub/scm/linux...
Linus Torvalds [Wed, 17 Jun 2020 00:23:57 +0000 (17:23 -0700)]
Merge tag 'flex-array-conversions-5.8-rc2' of git://git./linux/kernel/git/gustavoars/linux

Pull flexible-array member conversions from Gustavo A. R. Silva:
 "Replace zero-length arrays with flexible-array members.

  Notice that all of these patches have been baking in linux-next for
  two development cycles now.

  There is a regular need in the kernel to provide a way to declare
  having a dynamically sized set of trailing elements in a structure.
  Kernel code should always use “flexible array members”[1] for these
  cases. The older style of one-element or zero-length arrays should no
  longer be used[2].

  C99 introduced “flexible array members”, which lacks a numeric size
  for the array declaration entirely:

        struct something {
                size_t count;
                struct foo items[];
        };

  This is the way the kernel expects dynamically sized trailing elements
  to be declared. It allows the compiler to generate errors when the
  flexible array does not occur last in the structure, which helps to
  prevent some kind of undefined behavior[3] bugs from being
  inadvertently introduced to the codebase.

  It also allows the compiler to correctly analyze array sizes (via
  sizeof(), CONFIG_FORTIFY_SOURCE, and CONFIG_UBSAN_BOUNDS). For
  instance, there is no mechanism that warns us that the following
  application of the sizeof() operator to a zero-length array always
  results in zero:

        struct something {
                size_t count;
                struct foo items[0];
        };

        struct something *instance;

        instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
        instance->count = count;

        size = sizeof(instance->items) * instance->count;
        memcpy(instance->items, source, size);

  At the last line of code above, size turns out to be zero, when one
  might have thought it represents the total size in bytes of the
  dynamic memory recently allocated for the trailing array items. Here
  are a couple examples of this issue[4][5].

  Instead, flexible array members have incomplete type, and so the
  sizeof() operator may not be applied[6], so any misuse of such
  operators will be immediately noticed at build time.

  The cleanest and least error-prone way to implement this is through
  the use of a flexible array member:

        struct something {
                size_t count;
                struct foo items[];
        };

        struct something *instance;

        instance = kmalloc(struct_size(instance, items, count), GFP_KERNEL);
        instance->count = count;

        size = sizeof(instance->items[0]) * instance->count;
        memcpy(instance->items, source, size);

  instead"

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
[4] commit f2cd32a443da ("rndis_wlan: Remove logically dead code")
[5] commit ab91c2a89f86 ("tpm: eventlog: Replace zero-length array with flexible-array member")
[6] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html

* tag 'flex-array-conversions-5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux: (41 commits)
  w1: Replace zero-length array with flexible-array
  tracing/probe: Replace zero-length array with flexible-array
  soc: ti: Replace zero-length array with flexible-array
  tifm: Replace zero-length array with flexible-array
  dmaengine: tegra-apb: Replace zero-length array with flexible-array
  stm class: Replace zero-length array with flexible-array
  Squashfs: Replace zero-length array with flexible-array
  ASoC: SOF: Replace zero-length array with flexible-array
  ima: Replace zero-length array with flexible-array
  sctp: Replace zero-length array with flexible-array
  phy: samsung: Replace zero-length array with flexible-array
  RxRPC: Replace zero-length array with flexible-array
  rapidio: Replace zero-length array with flexible-array
  media: pwc: Replace zero-length array with flexible-array
  firmware: pcdp: Replace zero-length array with flexible-array
  oprofile: Replace zero-length array with flexible-array
  block: Replace zero-length array with flexible-array
  tools/testing/nvdimm: Replace zero-length array with flexible-array
  libata: Replace zero-length array with flexible-array
  kprobes: Replace zero-length array with flexible-array
  ...

4 years agox86/purgatory: Add -fno-stack-protector
Arvind Sankar [Tue, 16 Jun 2020 22:25:47 +0000 (18:25 -0400)]
x86/purgatory: Add -fno-stack-protector

The purgatory Makefile removes -fstack-protector options if they were
configured in, but does not currently add -fno-stack-protector.

If gcc was configured with the --enable-default-ssp configure option,
this results in the stack protector still being enabled for the
purgatory (absent distro-specific specs files that might disable it
again for freestanding compilations), if the main kernel is being
compiled with stack protection enabled (if it's disabled for the main
kernel, the top-level Makefile will add -fno-stack-protector).

This will break the build since commit
  e4160b2e4b02 ("x86/purgatory: Fail the build if purgatory.ro has missing symbols")
and prior to that would have caused runtime failure when trying to use
kexec.

Explicitly add -fno-stack-protector to avoid this, as done in other
Makefiles that need to disable the stack protector.

Reported-by: Gabriel C <nix.or.die@googlemail.com>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
4 years agoMerge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/net...
David S. Miller [Tue, 16 Jun 2020 23:16:24 +0000 (16:16 -0700)]
Merge branch '1GbE' of git://git./linux/kernel/git/jkirsher/net-queue

Jeff Kirsher says:

====================
Intel Wired LAN Driver Updates 2020-06-16

This series contains fixes to e1000 and e1000e.

Chen fixes an e1000e issue where systems could be waken via WoL, even
though the user has disabled the wakeup bit via sysfs.

Vaibhav Gupta updates the e1000 driver to clean up the legacy Power
Management hooks.

Arnd Bergmann cleans up the inconsistent use CONFIG_PM_SLEEP
preprocessor tags, which also resolves the compiler warnings about the
possibility of unused structure.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoe1000e: fix unused-function warning
Arnd Bergmann [Wed, 27 May 2020 13:47:00 +0000 (15:47 +0200)]
e1000e: fix unused-function warning

The CONFIG_PM_SLEEP #ifdef checks in this file are inconsistent,
leading to a warning about sometimes unused function:

drivers/net/ethernet/intel/e1000e/netdev.c:137:13: error: unused function 'e1000e_check_me' [-Werror,-Wunused-function]

Rather than adding more #ifdefs, just remove them completely
and mark the PM functions as __maybe_unused to let the compiler
work it out on it own.

Fixes: e086ba2fccda ("e1000e: disable s0ix entry and exit flows for ME systems")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
4 years agoe1000: use generic power management
Vaibhav Gupta [Mon, 25 May 2020 12:27:10 +0000 (17:57 +0530)]
e1000: use generic power management

With legacy PM hooks, it was the responsibility of a driver to manage PCI
states and also the device's power state. The generic approach is to let PCI
core handle the work.

e1000_suspend() calls __e1000_shutdown() to perform intermediate tasks.
__e1000_shutdown() modifies the value of "wake" (device should be wakeup
enabled or not), responsible for controlling the flow of legacy PM.

Since, PCI core has no idea about the value of "wake", new code for generic
PM may produce unexpected results. Thus, use "device_set_wakeup_enable()"
to wakeup-enable the device accordingly.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
4 years agoe1000e: Do not wake up the system via WOL if device wakeup is disabled
Chen Yu [Thu, 21 May 2020 17:59:00 +0000 (01:59 +0800)]
e1000e: Do not wake up the system via WOL if device wakeup is disabled

Currently the system will be woken up via WOL(Wake On LAN) even if the
device wakeup ability has been disabled via sysfs:
 cat /sys/devices/pci0000:00/0000:00:1f.6/power/wakeup
 disabled

The system should not be woken up if the user has explicitly
disabled the wake up ability for this device.

This patch clears the WOL ability of this network device if the
user has disabled the wake up ability in sysfs.

Fixes: bc7f75fa9788 ("[E1000E]: New pci-express e1000 driver")
Reported-by: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
4 years agolan743x: add MODULE_DEVICE_TABLE for module loading alias
Tim Harvey [Tue, 16 Jun 2020 15:31:58 +0000 (08:31 -0700)]
lan743x: add MODULE_DEVICE_TABLE for module loading alias

Without a MODULE_DEVICE_TABLE the attributes are missing that create
an alias for auto-loading the module in userspace via hotplug.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agoafs: Fix silly rename
David Howells [Mon, 15 Jun 2020 16:36:58 +0000 (17:36 +0100)]
afs: Fix silly rename

Fix AFS's silly rename by the following means:

 (1) Set the destination directory in afs_do_silly_rename() so as to avoid
     misbehaviour and indicate that the directory data version will
     increment by 1 so as to avoid warnings about unexpected changes in the
     DV.  Also indicate that the ctime should be updated to avoid xfstest
     grumbling.

 (2) Note when the server indicates that a directory changed more than we
     expected (AFS_OPERATION_DIR_CONFLICT), indicating a conflict with a
     third party change, checking on successful completion of unlink and
     rename.

     The problem is that the FS.RemoveFile RPC op doesn't report the status
     of the unlinked file, though YFS.RemoveFile2 does.  This can be
     mitigated by the assumption that if the directory DV cranked by
     exactly 1, we can be sure we removed one link from the file; further,
     ordinarily in AFS, files cannot be hardlinked across directories, so
     if we reduce nlink to 0, the file is deleted.

     However, if the directory DV jumps by more than 1, we cannot know if a
     third party intervened by adding or removing a link on the file we
     just removed a link from.

     The same also goes for any vnode that is at the destination of the
     FS.Rename RPC op.

 (3) Make afs_vnode_commit_status() apply the nlink drop inside the cb_lock
     section along with the other attribute updates if ->op_unlinked is set
     on the descriptor for the appropriate vnode.

 (4) Issue a follow up status fetch to the unlinked file in the event of a
     third party conflict that makes it impossible for us to know if we
     actually deleted the file or not.

 (5) Provide a flag, AFS_VNODE_SILLY_DELETED, to make afs_getattr() lie to
     the user about the nlink of a silly deleted file so that it appears as
     0, not 1.

Found with the generic/035 and generic/084 xfstests.

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
4 years agomlxsw: spectrum: Adjust headroom buffers for 8x ports
Ido Schimmel [Tue, 16 Jun 2020 07:14:58 +0000 (10:14 +0300)]
mlxsw: spectrum: Adjust headroom buffers for 8x ports

The port's headroom buffers are used to store packets while they
traverse the device's pipeline and also to store packets that are egress
mirrored.

On Spectrum-3, ports with eight lanes use two headroom buffers between
which the configured headroom size is split.

In order to prevent packet loss, multiply the calculated headroom size
by two for 8x ports.

Fixes: da382875c616 ("mlxsw: spectrum: Extend to support Spectrum-3 ASIC")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
4 years agobareudp: Fixed configuration to avoid having garbage values
Martin [Tue, 16 Jun 2020 05:48:58 +0000 (11:18 +0530)]
bareudp: Fixed configuration to avoid having garbage values

Code to initialize the conf structure while gathering the configuration
of the device was missing.

Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Martin <martin.varghese@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>