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| author | Oleg Nesterov <oleg@redhat.com> | 2014-09-21 20:41:53 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-09-24 15:15:38 +0200 |
| commit | 0ad6e3c5199be12c9745da8f8b9e3c9f8066c235 (patch) | |
| tree | 581d938c3bf976c54a95b2fd6030c232b7885031 /arch/x86/kernel/preempt.S | |
| parent | f3670394c29ff3730638762c1760fd2f624e6d7b (diff) | |
| download | talos-op-linux-0ad6e3c5199be12c9745da8f8b9e3c9f8066c235.tar.gz talos-op-linux-0ad6e3c5199be12c9745da8f8b9e3c9f8066c235.zip | |
x86: Speed up ___preempt_schedule*() by using THUNK helpers
___preempt_schedule() does SAVE_ALL/RESTORE_ALL but this is
suboptimal, we do not need to save/restore the callee-saved
register. And we already have arch/x86/lib/thunk_*.S which
implements the similar asm wrappers, so it makes sense to
redefine ___preempt_schedule() as "THUNK ..." and remove
preempt.S altogether.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140921184153.GA23727@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/preempt.S')
| -rw-r--r-- | arch/x86/kernel/preempt.S | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/arch/x86/kernel/preempt.S b/arch/x86/kernel/preempt.S deleted file mode 100644 index ca7f0d58a87d..000000000000 --- a/arch/x86/kernel/preempt.S +++ /dev/null @@ -1,25 +0,0 @@ - -#include <linux/linkage.h> -#include <asm/dwarf2.h> -#include <asm/asm.h> -#include <asm/calling.h> - -ENTRY(___preempt_schedule) - CFI_STARTPROC - SAVE_ALL - call preempt_schedule - RESTORE_ALL - ret - CFI_ENDPROC - -#ifdef CONFIG_CONTEXT_TRACKING - -ENTRY(___preempt_schedule_context) - CFI_STARTPROC - SAVE_ALL - call preempt_schedule_context - RESTORE_ALL - ret - CFI_ENDPROC - -#endif |
