[PATCH v2 1/1] printk: add __printf attributes to internal functions

[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_li...@m4x.org>
Acked-by: Petr Mladek <pmla...@suse.com>
---
v2: add __printf attribute to the definition of vprintk_nmi() which is
used when CONFIG_PRINTK_NMI is not defined.

 kernel/printk/printk_safe.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/printk/printk_safe.c b/kernel/printk/printk_safe.c
index 033e50a7d706..f96d1ecd85ac 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);
 
@@ -318,7 +318,7 @@ void printk_nmi_exit(void)
 
 #else
 
-static int vprintk_nmi(const char *fmt, va_list args)
+static __printf(1, 0) int vprintk_nmi(const char *fmt, va_list args)
 {
        return 0;
 }
@@ -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);
 
-- 
2.13.0