linux-kernel - [PATCH V2] bcache: replace snprintf in show functions with sysfs

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Date:   Wed, 13 Oct 2021 04:58:17 -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 V2] bcache: replace snprintf in show functions with sysfs_emit

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

Fix the following coccicheck warning:
drivers/md/bcache/sysfs.h:54:12-20: WARNING: use scnprintf or sprintf.

Implement sysfs_print() by sysfs_emit() and remove snprint() since no one 
uses it any more.

Suggested-by: Coly Li <colyli@...e.de>
Signed-off-by: Qing Wang <wangqing@...o.com>
---
 drivers/md/bcache/sysfs.h | 18 ++++++++++++++++--
 drivers/md/bcache/util.h  | 17 -----------------
 2 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/drivers/md/bcache/sysfs.h b/drivers/md/bcache/sysfs.h
index 215df32..c1752ba
--- a/drivers/md/bcache/sysfs.h
+++ b/drivers/md/bcache/sysfs.h
@@ -51,13 +51,27 @@ 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)						\
 do {									\
 	if (attr == &sysfs_ ## file)					\
-		return snprint(buf, PAGE_SIZE, var);			\
+		return sysfs_emit(buf,						\
+				__builtin_types_compatible_p(typeof(var), int)		\
+					 ? "%i\n" :				\
+				__builtin_types_compatible_p(typeof(var), unsigned int)	\
+					 ? "%u\n" :				\
+				__builtin_types_compatible_p(typeof(var), long)		\
+					 ? "%li\n" :			\
+				__builtin_types_compatible_p(typeof(var), unsigned long)\
+					 ? "%lu\n" :			\
+				__builtin_types_compatible_p(typeof(var), int64_t)	\
+					 ? "%lli\n" :			\
+				__builtin_types_compatible_p(typeof(var), uint64_t)	\
+					 ? "%llu\n" :			\
+				__builtin_types_compatible_p(typeof(var), const char *)	\
+					 ? "%s\n" : "%i\n", var);	\
 } while (0)
 
 #define sysfs_hprint(file, val)						\
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index b64460a..fecdea1
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -340,23 +340,6 @@ static inline int bch_strtoul_h(const char *cp, long *res)
 	_r;								\
 })
 
-#define snprint(buf, size, var)						\
-	snprintf(buf, size,						\
-		__builtin_types_compatible_p(typeof(var), int)		\
-		     ? "%i\n" :						\
-		__builtin_types_compatible_p(typeof(var), unsigned int)	\
-		     ? "%u\n" :						\
-		__builtin_types_compatible_p(typeof(var), long)		\
-		     ? "%li\n" :					\
-		__builtin_types_compatible_p(typeof(var), unsigned long)\
-		     ? "%lu\n" :					\
-		__builtin_types_compatible_p(typeof(var), int64_t)	\
-		     ? "%lli\n" :					\
-		__builtin_types_compatible_p(typeof(var), uint64_t)	\
-		     ? "%llu\n" :					\
-		__builtin_types_compatible_p(typeof(var), const char *)	\
-		     ? "%s\n" : "%i\n", var)
-
 ssize_t bch_hprint(char *buf, int64_t v);
 
 bool bch_is_zero(const char *p, size_t n);
-- 
2.7.4