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.ch...@mediatek.com> Reviewed-by: Steven Price <steven.pr...@arm.com> Acked-by: Michel Lespinasse <wal...@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