diff options
| author |   Helge Deller <deller@gmx.de> | 2017-05-29 17:14:16 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2017-06-09 11:31:06 +0200 |
| commit | 649aa24254e85bf6bd7807dd372d083707852b1f (patch) | |
| tree | 834c331b2c9074ddfa2a5a715d88f06ddbb07d90 /arch | |
| parent | parisc: Add Page Deallocation Table (PDT) support (diff) | |
| download | linux-dev-649aa24254e85bf6bd7807dd372d083707852b1f.tar.xz linux-dev-649aa24254e85bf6bd7807dd372d083707852b1f.zip | |
parisc/mm: Ensure IRQs are off in switch_mm()
This is because of commit f98db6013c55 ("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>
Diffstat (limited to '')
| -rw-r--r-- | arch/parisc/include/asm/mmu_context.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/parisc/include/asm/mmu_context.h b/arch/parisc/include/asm/mmu_context.h index 59be25764433..a81226257878 100644 --- a/arch/parisc/include/asm/mmu_context.h +++ b/arch/parisc/include/asm/mmu_context.h @@ -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) |