1 files changed, 8 insertions, 10 deletions
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index e05e167dbd16..8d38dcb6d044 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -73,6 +73,14 @@ static inline void mmap_assert_write_locked(struct mm_struct *mm)
 }
 
 #ifdef CONFIG_PER_VMA_LOCK
+/*
+ * Drop all currently-held per-VMA locks.
+ * This is called from the mmap_lock implementation directly before releasing
+ * a write-locked mmap_lock (or downgrading it to read-locked).
+ * This should normally NOT be called manually from other places.
+ * If you want to call this manually anyway, keep in mind that this will release
+ * *all* VMA write locks, including ones from further up the stack.
+ */
 static inline void vma_end_write_all(struct mm_struct *mm)
 {
 	mmap_assert_write_locked(mm);
@@ -118,16 +126,6 @@ static inline int mmap_write_lock_killable(struct mm_struct *mm)
 	return ret;
 }
 
-static inline bool mmap_write_trylock(struct mm_struct *mm)
-{
-	bool ret;
-
-	__mmap_lock_trace_start_locking(mm, true);
-	ret = down_write_trylock(&mm->mmap_lock) != 0;
-	__mmap_lock_trace_acquire_returned(mm, true, ret);
-	return ret;
-}
-
 static inline void mmap_write_unlock(struct mm_struct *mm)
 {
 	__mmap_lock_trace_released(mm, true);