From 0ad6e3c5199be12c9745da8f8b9e3c9f8066c235 Mon Sep 17 00:00:00 2001 From: Oleg Nesterov Date: Sun, 21 Sep 2014 20:41:53 +0200 Subject: 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 Reviewed-by: Andy Lutomirski Cc: Denys Vlasenko Cc: Peter Zijlstra Cc: Linus Torvalds Link: http://lkml.kernel.org/r/20140921184153.GA23727@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/kernel/Makefile | 2 -- 1 file changed, 2 deletions(-) (limited to 'arch/x86/kernel/Makefile') diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index ada2e2d6be3e..8f1e77440b2b 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 -- cgit v1.2.3