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Commit 649aa242 authored by Helge Deller's avatar Helge Deller
Browse files

parisc/mm: Ensure IRQs are off in switch_mm() 



This is because of commit f98db601 ("sched/core: Add switch_mm_irqs_off()
and use it in the scheduler") in which switch_mm_irqs_off() is called by the
scheduler, vs switch_mm() which is used by use_mm().

This patch lets the parisc code mirror the x86 and powerpc code, ie. it
disables interrupts in switch_mm(), and optimises the scheduler case by
defining switch_mm_irqs_off().

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent c9c2877d

arch/parisc/include/asm/mmu_context.h

+13 −2
Original line number Diff line number Diff line
@@ -49,15 +49,26 @@ static inline void load_context(mm_context_t context) 
	mtctl(__space_to_prot(context), 8);

}



static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)

static inline void switch_mm_irqs_off(struct mm_struct *prev,

		struct mm_struct *next, struct task_struct *tsk)

{



	if (prev != next) {

		mtctl(__pa(next->pgd), 25);

		load_context(next->context);

	}

}



static inline void switch_mm(struct mm_struct *prev,

		struct mm_struct *next, struct task_struct *tsk)

{

	unsigned long flags;



	local_irq_save(flags);

	switch_mm_irqs_off(prev, next, tsk);

	local_irq_restore(flags);

}

#define switch_mm_irqs_off switch_mm_irqs_off



#define deactivate_mm(tsk,mm)	do { } while (0)



static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)