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fs: use a consume fence in mnt_idmap()

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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@gmail.com>
Link: https://lore.kernel.org/r/20241130051712.1036527-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Mateusz Guzik 2024-11-30 06:17:11 +01:00 committed by Christian Brauner
parent 9b7da575f8
commit 3212a8f340
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1 changed files with 1 additions and 1 deletions
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include/linux/mount.h
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@ -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);