The routine is used in link_path_walk() for every path component.
To my reading the entire point of the fence was to grab a fully
populated mnt_idmap, but that's already going to happen with mere
consume fence.
Eliminates an actual fence on arm64.
Signed-off-by: Mateusz Guzik <mjguzik@xxxxxxxxx>
---
include/linux/mount.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/mount.h b/include/linux/mount.h
index c34c18b4e8f3..33f17b6e8732 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -76,7 +76,7 @@ struct vfsmount {
static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt)
{
/* Pairs with smp_store_release() in do_idmap_mount(). */
- return smp_load_acquire(&mnt->mnt_idmap);
+ return READ_ONCE(mnt->mnt_idmap);
}
extern int mnt_want_write(struct vfsmount *mnt);
--
2.43.0
