vfs: stop counting on gcc not messing with mnt_expiry_mark if not asked
So happens it already was not doing it, but there is no need to "hope"
as indicated in the comment.
No changes in generated assembly.
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20231004111916.728135-3-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
diff --git a/fs/namespace.c b/fs/namespace.c
index 9e0ea73..6bde717 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1346,9 +1346,9 @@ void mntput(struct vfsmount *mnt)
{
if (mnt) {
struct mount *m = real_mount(mnt);
- /* avoid cacheline pingpong, hope gcc doesn't get "smart" */
+ /* avoid cacheline pingpong */
if (unlikely(m->mnt_expiry_mark))
- m->mnt_expiry_mark = 0;
+ WRITE_ONCE(m->mnt_expiry_mark, 0);
mntput_no_expire(m);
}
}
