linux-kernel - [PATCH 11/18] dm space map metadata: use ARRAY

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Date:   Sun,  1 Oct 2017 15:30:49 -0400
From:   Jérémy Lefaure 
        <jeremy.lefaure@....epita.fr>
To:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Shaohua Li <shli@...nel.org>
Cc:     Jérémy Lefaure 
        <jeremy.lefaure@....epita.fr>, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 11/18] dm space map metadata: use ARRAY_SIZE

Using the ARRAY_SIZE macro improves the readability of the code.

Found with Coccinelle with the following semantic patch:
@r depends on (org || report)@
type T;
T[] E;
position p;
@@
(
 (sizeof(E)@p /sizeof(*E))
|
 (sizeof(E)@p /sizeof(E[...]))
|
 (sizeof(E)@p /sizeof(T))
)

Signed-off-by: Jérémy Lefaure <jeremy.lefaure@....epita.fr>
---
 drivers/md/persistent-data/dm-space-map-metadata.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/persistent-data/dm-space-map-metadata.c b/drivers/md/persistent-data/dm-space-map-metadata.c
index 4aed69d9dd17..aec449243966 100644
--- a/drivers/md/persistent-data/dm-space-map-metadata.c
+++ b/drivers/md/persistent-data/dm-space-map-metadata.c
@@ -11,6 +11,7 @@
 #include <linux/list.h>
 #include <linux/slab.h>
 #include <linux/device-mapper.h>
+#include <linux/kernel.h>
 
 #define DM_MSG_PREFIX "space map metadata"
 
@@ -111,7 +112,7 @@ static bool brb_empty(struct bop_ring_buffer *brb)
 static unsigned brb_next(struct bop_ring_buffer *brb, unsigned old)
 {
 	unsigned r = old + 1;
-	return (r >= (sizeof(brb->bops) / sizeof(*brb->bops))) ? 0 : r;
+	return r >= ARRAY_SIZE(brb->bops) ? 0 : r;
 }
 
 static int brb_push(struct bop_ring_buffer *brb,
-- 
2.14.1