Unverified Commit 3212a8f3 authored by Mateusz Guzik's avatar Mateusz Guzik Committed by Christian Brauner
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fs: use a consume fence in mnt_idmap() 



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: default avatarMateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20241130051712.1036527-1-mjguzik@gmail.com


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 9b7da575

include/linux/mount.h

+1 −1
Original line number Diff line number Diff line
@@ -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);