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authorOleg Nesterov <oleg@redhat.com>2014-09-21 20:41:53 +0200
committerIngo Molnar <mingo@kernel.org>2014-09-24 15:15:38 +0200
commit0ad6e3c5199be12c9745da8f8b9e3c9f8066c235 (patch)
tree581d938c3bf976c54a95b2fd6030c232b7885031 /arch/x86/kernel/Makefile
parentf3670394c29ff3730638762c1760fd2f624e6d7b (diff)
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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/Makefile2
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
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