linux-kernel - [PATCH] bcache: replace snprintf in show functions with sysfs

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Date:   Tue, 12 Oct 2021 20:27:18 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Coly Li <colyli@...e.de>,
        Kent Overstreet <kent.overstreet@...il.com>,
        linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: [PATCH] bcache: replace snprintf in show functions with sysfs_emit

coccicheck complains about the use of snprintf() in sysfs show functions.

Fix the coccicheck warning:
WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.

Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/md/bcache/sysfs.c | 2 +-
 drivers/md/bcache/sysfs.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 05ac1d6..e146c9e 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -639,7 +639,7 @@ static int bch_bset_print_stats(struct cache_set *c, char *buf)
 	if (ret < 0)
 		return ret;
 
-	return snprintf(buf, PAGE_SIZE,
+	return sysfs_emit(buf,
 			"btree nodes:		%zu\n"
 			"written sets:		%zu\n"
 			"unwritten sets:		%zu\n"
diff --git a/drivers/md/bcache/sysfs.h b/drivers/md/bcache/sysfs.h
index 215df32..8bec32d 100644
--- a/drivers/md/bcache/sysfs.h
+++ b/drivers/md/bcache/sysfs.h
@@ -51,7 +51,7 @@ STORE(fn)								\
 #define sysfs_printf(file, fmt, ...)					\
 do {									\
 	if (attr == &sysfs_ ## file)					\
-		return snprintf(buf, PAGE_SIZE, fmt "\n", __VA_ARGS__);	\
+		return sysfs_emit(buf, fmt "\n", __VA_ARGS__);	\
 } while (0)
 
 #define sysfs_print(file, var)						\
-- 
2.7.4