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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/Makefile | |
| parent | f3670394c29ff3730638762c1760fd2f624e6d7b (diff) | |
| download | op-kernel-dev-0ad6e3c5199be12c9745da8f8b9e3c9f8066c235.zip op-kernel-dev-0ad6e3c5199be12c9745da8f8b9e3c9f8066c235.tar.gz | |
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/Makefile')
| -rw-r--r-- | arch/x86/kernel/Makefile | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index ada2e2d..8f1e774 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -39,8 +39,6 @@ obj-y += tsc.o tsc_msr.o io_delay.o rtc.o obj-y += pci-iommu_table.o obj-y += resource.o -obj-$(CONFIG_PREEMPT) += preempt.o - obj-y += process.o obj-y += i387.o xsave.o obj-y += ptrace.o |
