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x86/irq/tracing: Do not save callee-preserved registers around lockdep_sys_exit_thunk

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Internally, lockdep_sys_exit_thunk saves callee-clobbered
registers, and calls a C function, lockdep_sys_exit. Thus,
callee-preserved registers won't be mangled, there is no need to
save them.

Patch was run-tested.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1427314468-12763-4-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Denys Vlasenko 2015-03-25 21:14:28 +01:00 committed by Ingo Molnar
parent 7dc7cc0780
commit aa6d9a128b
1 changed files with 0 additions and 2 deletions
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2
arch/x86/include/asm/irqflags.h
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@ -179,9 +179,7 @@ static inline int arch_irqs_disabled(void)
# define LOCKDEP_SYS_EXIT_IRQ \
TRACE_IRQS_ON; \
sti; \
SAVE_EXTRA_REGS; \
call lockdep_sys_exit_thunk; \
RESTORE_EXTRA_REGS; \
cli; \
TRACE_IRQS_OFF;
# else