diff options
| author | Josh Poimboeuf <[email protected]> | 2016-10-13 16:26:15 -0500 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2016-10-18 12:21:16 +0200 |
| commit | 55a76b59b5fef408442e16121faa9eb00a65fd50 (patch) | |
| tree | 20716520fdd5960572e15f6b0dbac064e7b9ca34 /tools/perf/scripts/python | |
| parent | 1001354ca34179f3db924eb66672442a173147dc (diff) | |
locking/rwsem/x86: Add stack frame dependency for ____down_write()
Arnd reported the following objtool warning:
kernel/locking/rwsem.o: warning: objtool: down_write_killable()+0x16: call without frame pointer save/setup
The warning means gcc placed the ____down_write() inline asm (and its
call instruction) before the frame pointer setup in
down_write_killable(), which breaks frame pointer convention and can
result in incorrect stack traces.
Force the stack frame to be created before the call instruction by
listing the stack pointer as an output operand in the inline asm
statement.
Reported-by: Arnd Bergmann <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/1188b7015f04baf361e59de499ee2d7272c59dce.1476393828.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions