linux-kernel - [PATCH 2/2] mm/zswap: move `zswap_has

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Message-Id: <20180102100320.24801-3-joeypabalinas@gmail.com>
Date:   Tue,  2 Jan 2018 00:03:20 -1000
From:   Joey Pabalinas <joeypabalinas@...il.com>
To:     linux-mm@...ck.org
Cc:     sjenning@...hat.com, ddstreet@...e.org,
        linux-kernel@...r.kernel.org,
        Joey Pabalinas <joeypabalinas@...il.com>
Subject: [PATCH 2/2] mm/zswap: move `zswap_has_pool` to front of `if ()`

`zwap_has_pool` is a simple boolean, so it should be tested first
to avoid unnecessarily calling `strcmp()`. Test `zswap_has_pool`
first to take advantage of the short-circuiting behavior of && in
`__zswap_param_set()`.

Signed-off-by: Joey Pabalinas <joeypabalinas@...il.com>

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index a4f2dfaf9131694265..dbf35139471f692798 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -672,7 +672,7 @@ static int __zswap_param_set(const char *val, const struct kernel_param *kp,
 	}
 
 	/* no change required */
-	if (!strcmp(s, *(char **)kp->arg) && zswap_has_pool)
+	if (zswap_has_pool && !strcmp(s, *(char **)kp->arg))
 		return 0;
 
 	/* if this is load-time (pre-init) param setting,
-- 
2.15.1