objtool, modules: Discard objtool annotation sections for modules
authorJosh Poimboeuf <jpoimboe@redhat.com>
Wed, 1 Mar 2017 18:04:44 +0000 (12:04 -0600)
committerIngo Molnar <mingo@kernel.org>
Wed, 1 Mar 2017 19:32:25 +0000 (20:32 +0100)
commite390f9a9689a42f477a6073e2e7df530a4c1b740
tree8d065e301c3781e102d04d0ce9051be27fe0df6e
parent55149d06534ae2a7ba5f7a078353deb89b3fe891
objtool, modules: Discard objtool annotation sections for modules

The '__unreachable' and '__func_stack_frame_non_standard' sections are
only used at compile time.  They're discarded for vmlinux but they
should also be discarded for modules.

Since this is a recurring pattern, prefix the section names with
".discard.".  It's a nice convention and vmlinux.lds.h already discards
such sections.

Also remove the 'a' (allocatable) flag from the __unreachable section
since it doesn't make sense for a discarded section.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Jessica Yu <jeyu@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
Link: http://lkml.kernel.org/r/20170301180444.lhd53c5tibc4ns77@treble
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/vmlinux.lds.S
include/linux/compiler-gcc.h
include/linux/frame.h
scripts/mod/modpost.c
scripts/module-common.lds
tools/objtool/builtin-check.c