Messages in this thread Patch in this message |  | | From | Davidlohr Bueso <> | Subject | [PATCH 03/64] mm: introduce mm locking wrappers | Date | Mon, 5 Feb 2018 02:26:53 +0100 |
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From: Davidlohr Bueso <dave@stgolabs.net>
This patch adds the necessary wrappers to encapsulate mmap_sem locking and will enable any future changes to be a lot more confined to here. In addition, future users will incrementally be added in the next patches. mm_[read/write]_[un]lock() naming is used.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de> --- include/linux/mm.h | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 47c06fd20f6a..9d2ed23aa894 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -12,6 +12,7 @@ #include <linux/list.h> #include <linux/mmzone.h> #include <linux/rbtree.h> +#include <linux/range_lock.h> #include <linux/atomic.h> #include <linux/debug_locks.h> #include <linux/mm_types.h> @@ -2675,5 +2676,77 @@ void __init setup_nr_node_ids(void); static inline void setup_nr_node_ids(void) {} #endif +/* + * Address space locking wrappers. + */ +static inline bool mm_is_locked(struct mm_struct *mm, + struct range_lock *range) +{ + return rwsem_is_locked(&mm->mmap_sem); +} + +/* Reader wrappers */ +static inline int mm_read_trylock(struct mm_struct *mm, + struct range_lock *range) +{ + return down_read_trylock(&mm->mmap_sem); +} + +static inline void mm_read_lock(struct mm_struct *mm, struct range_lock *range) +{ + down_read(&mm->mmap_sem); +} + +static inline void mm_read_lock_nested(struct mm_struct *mm, + struct range_lock *range, int subclass) +{ + down_read_nested(&mm->mmap_sem, subclass); +} + +static inline void mm_read_unlock(struct mm_struct *mm, + struct range_lock *range) +{ + up_read(&mm->mmap_sem); +} + +/* Writer wrappers */ +static inline int mm_write_trylock(struct mm_struct *mm, + struct range_lock *range) +{ + return down_write_trylock(&mm->mmap_sem); +} + +static inline void mm_write_lock(struct mm_struct *mm, struct range_lock *range) +{ + down_write(&mm->mmap_sem); +} + +static inline int mm_write_lock_killable(struct mm_struct *mm, + struct range_lock *range) +{ + return down_write_killable(&mm->mmap_sem); +} + +static inline void mm_downgrade_write(struct mm_struct *mm, + struct range_lock *range) +{ + downgrade_write(&mm->mmap_sem); +} + +static inline void mm_write_unlock(struct mm_struct *mm, + struct range_lock *range) +{ + up_write(&mm->mmap_sem); +} + +static inline void mm_write_lock_nested(struct mm_struct *mm, + struct range_lock *range, int subclass) +{ + down_write_nested(&mm->mmap_sem, subclass); +} + +#define mm_write_nest_lock(mm, range, nest_lock) \ + down_write_nest_lock(&(mm)->mmap_sem, nest_lock) + #endif /* __KERNEL__ */ #endif /* _LINUX_MM_H */ -- 2.13.6
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