This patch allow to invalidate a range while excluding call to a specific mmu_notifier which allow for a subsystem to invalidate a range for everyone but itself. Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx> --- include/linux/mmu_notifier.h | 66 ++++++++++++++++++++++++++++++++++++++++---- mm/mmu_notifier.c | 16 +++++++++-- 2 files changed, 73 insertions(+), 9 deletions(-) diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 1a20145c..794d626 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -291,11 +291,15 @@ extern void __mmu_notifier_invalidate_page(struct mm_struct *mm, struct page *page, enum mmu_event event); extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, - struct mmu_notifier_range *range); + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude); extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, - struct mmu_notifier_range *range); + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude); extern void __mmu_notifier_invalidate_range(struct mm_struct *mm, - unsigned long start, unsigned long end); + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude); extern bool mmu_notifier_range_is_valid(struct mm_struct *mm, unsigned long start, unsigned long end); @@ -348,21 +352,49 @@ static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm, struct mmu_notifier_range *range) { if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range_start(mm, range); + __mmu_notifier_invalidate_range_start(mm, range, NULL); } static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm, struct mmu_notifier_range *range) { if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range_end(mm, range); + __mmu_notifier_invalidate_range_end(mm, range, NULL); } static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, unsigned long start, unsigned long end) { if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range(mm, start, end); + __mmu_notifier_invalidate_range(mm, start, end, NULL); +} + +static inline void mmu_notifier_invalidate_range_start_excluding( + struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ + if (mm_has_notifiers(mm)) + __mmu_notifier_invalidate_range_start(mm, range, exclude); +} + +static inline void mmu_notifier_invalidate_range_end_excluding( + struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ + if (mm_has_notifiers(mm)) + __mmu_notifier_invalidate_range_end(mm, range, exclude); +} + +static inline void mmu_notifier_invalidate_range_excluding( + struct mm_struct *mm, + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude) +{ + if (mm_has_notifiers(mm)) + __mmu_notifier_invalidate_range(mm, start, end, exclude); } static inline void mmu_notifier_mm_init(struct mm_struct *mm) @@ -512,6 +544,28 @@ static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, { } +static inline void mmu_notifier_invalidate_range_start_excluding( + struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ +} + +static inline void mmu_notifier_invalidate_range_end_excluding( + struct mm_struct *mm, + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) +{ +} + +static inline void mmu_notifier_invalidate_range_excluding( + struct mm_struct *mm, + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude) +{ +} + static inline void mmu_notifier_mm_init(struct mm_struct *mm) { } diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 2ed6d0d..c673ba9 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -175,7 +175,8 @@ void __mmu_notifier_invalidate_page(struct mm_struct *mm, } void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, - struct mmu_notifier_range *range) + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) { struct mmu_notifier *mn; @@ -188,6 +189,8 @@ void __mmu_notifier_invalidate_range_start(struct mm_struct *mm, id = srcu_read_lock(&srcu); hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + if (mn == exclude) + continue; if (mn->ops->invalidate_range_start) mn->ops->invalidate_range_start(mn, mm, range); } @@ -196,13 +199,16 @@ 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, - struct mmu_notifier_range *range) + struct mmu_notifier_range *range, + const struct mmu_notifier *exclude) { struct mmu_notifier *mn; int id; id = srcu_read_lock(&srcu); hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + if (mn == exclude) + continue; /* * Call invalidate_range here too to avoid the need for the * subsystem of having to register an invalidate_range_end @@ -233,13 +239,17 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_end); void __mmu_notifier_invalidate_range(struct mm_struct *mm, - unsigned long start, unsigned long end) + unsigned long start, + unsigned long end, + const struct mmu_notifier *exclude) { struct mmu_notifier *mn; int id; id = srcu_read_lock(&srcu); hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + if (mn == exclude) + continue; if (mn->ops->invalidate_range) mn->ops->invalidate_range(mn, mm, start, end); } -- 1.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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