samples/bpf: adjust Makefile and README.rst

Side effect of some kbuild changes resulted in breaking the
documented way to build samples/bpf/.

This patch change the samples/bpf/Makefile to work again, when
invoking make from the subdir samples/bpf/. Also update the
documentation in README.rst, to reflect the new way to build.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index d88c012752394d3f5769850dd2c4d684ce661983..8e32a4d29a3824ffe1450dde3ed18246fbb97af2 100644 (file)
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -203,7 +203,7 @@ TPROGLDLIBS_test_overhead   += -lrt
 TPROGLDLIBS_xdpsock            += -pthread
 
 # Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
-#  make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
+#  make M=samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
 LLC ?= llc
 CLANG ?= clang
 LLVM_OBJCOPY ?= llvm-objcopy
@@ -246,7 +246,7 @@ endif
 
 # Trick to allow make to be run from this directory
 all:
-       $(MAKE) -C ../../ $(CURDIR)/ BPF_SAMPLES_PATH=$(CURDIR)
+       $(MAKE) -C ../../ M=$(CURDIR) BPF_SAMPLES_PATH=$(CURDIR)
 
 clean:
        $(MAKE) -C ../../ M=$(CURDIR) clean

diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst
index cc1f00a1ee060d438cc90171934e88e4193fe6be..dd34b2d26f1c70ceb30c160b6c2b5e1bcd06f78b 100644 (file)
--- a/samples/bpf/README.rst
+++ b/samples/bpf/README.rst
@@ -46,12 +46,10 @@ Compiling
 For building the BPF samples, issue the below command from the kernel
 top level directory::
 
- make samples/bpf/
-
-Do notice the "/" slash after the directory name.
+ make M=samples/bpf
 
 It is also possible to call make from this directory.  This will just
-hide the the invocation of make as above with the appended "/".
+hide the invocation of make as above.
 
 Manually compiling LLVM with 'bpf' support
 ------------------------------------------
@@ -77,7 +75,7 @@ Quick sniplet for manually compiling LLVM and clang
 It is also possible to point make to the newly compiled 'llc' or
 'clang' command via redefining LLC or CLANG on the make command line::
 
- make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
+ make M=samples/bpf LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
 
 Cross compiling samples
 -----------------------
@@ -98,10 +96,10 @@ Pointing LLC and CLANG is not necessarily if it's installed on HOST and have
 in its targets appropriate arm64 arch (usually it has several arches).
 Build samples::
 
- make samples/bpf/
+ make M=samples/bpf
 
 Or build samples with SYSROOT if some header or library is absent in toolchain,
 say libelf, providing address to file system containing headers and libs,
 can be RFS of target board::
 
- make samples/bpf/ SYSROOT=~/some_sysroot
+ make M=samples/bpf SYSROOT=~/some_sysroot