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Message-ID: <20241007085303.48312-1-ubizjak@gmail.com>
Date: Mon, 7 Oct 2024 10:52:37 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Jan Kara <jack@...e.cz>
Subject: [PATCH] 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@...il.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Jan Kara <jack@...e.cz>
---
fs/namespace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index 93c377816d75..9a3c251d033d 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;
--
2.46.2
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