diff options
Diffstat (limited to 'mm/mmu_notifier.c')
| -rw-r--r-- | mm/mmu_notifier.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 314285284e6e..96edb33fd09a 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -190,7 +190,9 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start); void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, - unsigned long start, unsigned long end) + unsigned long start, + unsigned long end, + bool only_end) { struct mmu_notifier *mn; int id; @@ -204,8 +206,13 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, * subsystem registers either invalidate_range_start()/end() or * invalidate_range(), so this will be no additional overhead * (besides the pointer check). + * + * We skip call to invalidate_range() if we know it is safe ie + * call site use mmu_notifier_invalidate_range_only_end() which + * is safe to do when we know that a call to invalidate_range() + * already happen under page table lock. */ - if (mn->ops->invalidate_range) + if (!only_end && mn->ops->invalidate_range) mn->ops->invalidate_range(mn, mm, start, end); if (mn->ops->invalidate_range_end) mn->ops->invalidate_range_end(mn, mm, start, end); |