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

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This is because of commit f98db6013c ("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: Helge Deller <deller@gmx.de>
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2017-05-29 17:14:16 +02:00
parent c9c2877d08
commit 649aa24254
1 changed files with 13 additions and 2 deletions
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15
arch/parisc/include/asm/mmu_context.h
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@ -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)