linux-kernel - [PATCH linux-next] net: ceph: use swap() macro instead of taking tmp variable

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Date:   Tue, 12 Apr 2022 14:46:20 +0800
From:   Guo Zhengkui <guozhengkui@...o.com>
To:     Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>, Xiubo Li <xiubli@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Guo Zhengkui <guozhengkui@...o.com>,
        ceph-devel@...r.kernel.org (open list:CEPH COMMON CODE (LIBCEPH)),
        netdev@...r.kernel.org (open list:NETWORKING [GENERAL]),
        linux-kernel@...r.kernel.org (open list)
Cc:     zhengkui_guo@...look.com
Subject: [PATCH linux-next] net: ceph: use swap() macro instead of taking tmp variable

Fix the following coccicheck warning:
net/ceph/crush/mapper.c:1077:8-9: WARNING opportunity for swap()

by using swap() for the swapping of variable values and drop
the tmp variable that is not needed any more.

Signed-off-by: Guo Zhengkui <guozhengkui@...o.com>
---
 net/ceph/crush/mapper.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
index 7057f8db4f99..1daf95e17d67 100644
--- a/net/ceph/crush/mapper.c
+++ b/net/ceph/crush/mapper.c
@@ -906,7 +906,6 @@ int crush_do_rule(const struct crush_map *map,
 	int recurse_to_leaf;
 	int wsize = 0;
 	int osize;
-	int *tmp;
 	const struct crush_rule *rule;
 	__u32 step;
 	int i, j;
@@ -1073,9 +1072,7 @@ int crush_do_rule(const struct crush_map *map,
 				memcpy(o, c, osize*sizeof(*o));
 
 			/* swap o and w arrays */
-			tmp = o;
-			o = w;
-			w = tmp;
+			swap(o, w);
 			wsize = osize;
 			break;
 
-- 
2.20.1