From 1a338ac32ca630f67df25b4a16436cccc314e997 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 14 Aug 2013 14:51:00 +0200 Subject: sched, x86: Optimize the preempt_schedule() call Remove the bloat of the C calling convention out of the preempt_enable() sites by creating an ASM wrapper which allows us to do an asm("call ___preempt_schedule") instead. calling.h bits by Andi Kleen Suggested-by: Linus Torvalds Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/n/tip-tk7xdi1cvvxewixzke8t8le1@git.kernel.org [ Fixed build error. ] Signed-off-by: Ingo Molnar --- include/linux/preempt.h | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) (limited to 'include/linux/preempt.h') diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 2343d8715299..a3d9dc8c2c00 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -50,18 +50,17 @@ do { \ #define preempt_enable_no_resched() sched_preempt_enable_no_resched() #ifdef CONFIG_PREEMPT -asmlinkage void preempt_schedule(void); #define preempt_enable() \ do { \ barrier(); \ if (unlikely(preempt_count_dec_and_test())) \ - preempt_schedule(); \ + __preempt_schedule(); \ } while (0) #define preempt_check_resched() \ do { \ if (should_resched()) \ - preempt_schedule(); \ + __preempt_schedule(); \ } while (0) #else @@ -83,17 +82,15 @@ do { \ #ifdef CONFIG_PREEMPT -#ifdef CONFIG_CONTEXT_TRACKING -asmlinkage void preempt_schedule_context(void); -#else -#define preempt_schedule_context() preempt_schedule() +#ifndef CONFIG_CONTEXT_TRACKING +#define __preempt_schedule_context() __preempt_schedule() #endif #define preempt_enable_notrace() \ do { \ barrier(); \ if (unlikely(__preempt_count_dec_and_test())) \ - preempt_schedule_context(); \ + __preempt_schedule_context(); \ } while (0) #else #define preempt_enable_notrace() preempt_enable_no_resched_notrace() -- cgit