[PATCH 1/1] printk: add __printf attributes to internal functions

* [PATCH 1/1] printk: add __printf attributes to internal functions
@ 2017-05-20  9:18 Nicolas Iooss
  2017-05-22  2:48 ` Sergey Senozhatsky
  2017-05-22 15:22 ` Petr Mladek
  0 siblings, 2 replies; 6+ messages in thread
From: Nicolas Iooss @ 2017-05-20  9:18 UTC (permalink / raw)
  To: Petr Mladek, Sergey Senozhatsky, Steven Rostedt
  Cc: linux-kernel, Nicolas Iooss

When compiling with -Wsuggest-attribute=format, gcc complains that some
functions in kernel/printk/printk_safe.c transmit their argument to
printf-like functions without having a printf attribute. Silence these
warnings by adding relevant __printf attributes.

Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
---
 kernel/printk/printk_safe.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/printk/printk_safe.c b/kernel/printk/printk_safe.c
index 033e50a7d706..2e27a31941f4 100644
--- a/kernel/printk/printk_safe.c
+++ b/kernel/printk/printk_safe.c
@@ -80,8 +80,8 @@ static void queue_flush_work(struct printk_safe_seq_buf *s)
  * happen, printk_safe_log_store() will notice the buffer->len mismatch
  * and repeat the write.
  */
-static int printk_safe_log_store(struct printk_safe_seq_buf *s,
-				 const char *fmt, va_list args)
+static __printf(2, 0) int printk_safe_log_store(struct printk_safe_seq_buf *s,
+						const char *fmt, va_list args)
 {
 	int add;
 	size_t len;
@@ -299,7 +299,7 @@ void printk_safe_flush_on_panic(void)
  * one writer running. But the buffer might get flushed from another
  * CPU, so we need to be careful.
  */
-static int vprintk_nmi(const char *fmt, va_list args)
+static __printf(1, 0) int vprintk_nmi(const char *fmt, va_list args)
 {
 	struct printk_safe_seq_buf *s = this_cpu_ptr(&nmi_print_seq);
 
@@ -330,7 +330,7 @@ static int vprintk_nmi(const char *fmt, va_list args)
  * into itself. It uses a per-CPU buffer to store the message, just like
  * NMI.
  */
-static int vprintk_safe(const char *fmt, va_list args)
+static __printf(1, 0) int vprintk_safe(const char *fmt, va_list args)
 {
 	struct printk_safe_seq_buf *s = this_cpu_ptr(&safe_print_seq);
 
-- 
2.12.2

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