Messages in this thread Patch in this message | | | From | Chinwen Chang <> | Subject | [RESEND, PATCH v4 1/3] mmap locking API: add mmap_lock_is_contended() | Date | Mon, 5 Oct 2020 10:40:12 +0800 |
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Add new API to query if someone wants to acquire mmap_lock for write attempts.
Using this instead of rwsem_is_contended makes it more tolerant of future changes to the lock type.
Change-Id: Idb21478bb0580ba72b9926aba3bbc4b1f75deec2 Signed-off-by: Chinwen Chang <chinwen.chang@mediatek.com> Reviewed-by: Steven Price <steven.price@arm.com> Acked-by: Michel Lespinasse <walken@google.com> --- include/linux/mmap_lock.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h index 0707671..18e7eae 100644 --- a/include/linux/mmap_lock.h +++ b/include/linux/mmap_lock.h @@ -87,4 +87,9 @@ static inline void mmap_assert_write_locked(struct mm_struct *mm) VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_lock), mm); } +static inline int mmap_lock_is_contended(struct mm_struct *mm) +{ + return rwsem_is_contended(&mm->mmap_lock); +} + #endif /* _LINUX_MMAP_LOCK_H */ -- 1.9.1 | |