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Commit f98db601 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Ingo Molnar
Browse files

sched/core: Add switch_mm_irqs_off() and use it in the scheduler 



By default, this is the same thing as switch_mm().

x86 will override it as an optimization.

Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/df401df47bdd6be3e389c6f1e3f5310d70e81b2c.1461688545.git.luto@kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 8efd755a

include/linux/mmu_context.h

+7 −0
Original line number Diff line number Diff line 
#ifndef _LINUX_MMU_CONTEXT_H

#define _LINUX_MMU_CONTEXT_H



#include <asm/mmu_context.h>



struct mm_struct;



void use_mm(struct mm_struct *mm);

void unuse_mm(struct mm_struct *mm);



/* Architectures that care about IRQ state in switch_mm can override this. */

#ifndef switch_mm_irqs_off

# define switch_mm_irqs_off switch_mm

#endif



#endif

kernel/sched/core.c

+3 −3
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ 
#include <linux/init.h>

#include <linux/uaccess.h>

#include <linux/highmem.h>

#include <asm/mmu_context.h>

#include <linux/mmu_context.h>

#include <linux/interrupt.h>

#include <linux/capability.h>

#include <linux/completion.h>
@@ -2733,7 +2733,7 @@ context_switch(struct rq *rq, struct task_struct *prev, 
		atomic_inc(&oldmm->mm_count);

		enter_lazy_tlb(oldmm, next);

	} else

		switch_mm(oldmm, mm, next);

		switch_mm_irqs_off(oldmm, mm, next);



	if (!prev->mm) {

		prev->active_mm = NULL;
@@ -5274,7 +5274,7 @@ void idle_task_exit(void) 
	BUG_ON(cpu_online(smp_processor_id()));



	if (mm != &init_mm) {

		switch_mm(mm, &init_mm, current);

		switch_mm_irqs_off(mm, &init_mm, current);

		finish_arch_post_lock_switch();

	}

	mmdrop(mm);