From: Uros Bizjak <ubizjak@gmail.com>
Date: Mon, 7 Oct 2024 08:52:37 +0000 (+0200)
Subject: namespace: Use atomic64_inc_return() in alloc_mnt_ns()
X-Git-Tag: v6.13-rc1~229^2~20
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=0cb9c994e71c15555cf8c3d12fda10fa8f5dcdea;p=thirdparty%2Fkernel%2Flinux.git

namespace: Use atomic64_inc_return() in alloc_mnt_ns()

Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref)
to use optimized implementation and ease register pressure around
the primitive for targets that implement optimized variant.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Link: https://lore.kernel.org/r/20241007085303.48312-1-ubizjak@gmail.com
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---

diff --git a/fs/namespace.c b/fs/namespace.c
index 93c377816d75d..9a3c251d033de 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3901,7 +3901,7 @@ static struct mnt_namespace *alloc_mnt_ns(struct user_namespace *user_ns, bool a
 	}
 	new_ns->ns.ops = &mntns_operations;
 	if (!anon)
-		new_ns->seq = atomic64_add_return(1, &mnt_ns_seq);
+		new_ns->seq = atomic64_inc_return(&mnt_ns_seq);
 	refcount_set(&new_ns->ns.count, 1);
 	refcount_set(&new_ns->passive, 1);
 	new_ns->mounts = RB_ROOT;