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| author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-03-25 21:14:28 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-27 10:01:49 +0100 |
| commit | aa6d9a128b861fe7e9dc37bcc37179837674b739 (patch) | |
| tree | a5f9a4b9f1319105e9b2557fd281793e309cfba0 /arch/x86/include/asm/irqflags.h | |
| parent | 7dc7cc0780b04935f1127fa22ee23e9d6daf166a (diff) | |
| download | linux-0-day-aa6d9a128b861fe7e9dc37bcc37179837674b739.tar.gz linux-0-day-aa6d9a128b861fe7e9dc37bcc37179837674b739.tar.xz | |
x86/irq/tracing: Do not save callee-preserved registers around lockdep_sys_exit_thunk
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>
Diffstat (limited to 'arch/x86/include/asm/irqflags.h')
| -rw-r--r-- | arch/x86/include/asm/irqflags.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h index 19355f34c4a3a..9a63eae04e4bb 100644 --- a/arch/x86/include/asm/irqflags.h +++ b/arch/x86/include/asm/irqflags.h @@ -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 |