Re: [PATCH v1 1/6] seq_buf: Mark binary printing functions with __printf() attribute

[Steven Rostedt]

On Thu, 20 Mar 2025 20:04:22 +0200
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:

> Binary printing functions are using printf() type of format, and compiler
> is not happy about them as is:
> 
> lib/seq_buf.c:162:17: error: function ‘seq_buf_bprintf’ might be a candidate for ‘gnu_printf’ format attribute [-Werror=suggest-attribute=format]
> 
> Fix the compilation errors by adding __printf() attribute.
> 

Should also note the removal of "extern"

-- Steve

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> ---
>  include/linux/seq_buf.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
> index fe41da005970..52791e070506 100644
> --- a/include/linux/seq_buf.h
> +++ b/include/linux/seq_buf.h
> @@ -167,8 +167,8 @@ extern int seq_buf_hex_dump(struct seq_buf *s, const char *prefix_str,
>  			    const void *buf, size_t len, bool ascii);
>  
>  #ifdef CONFIG_BINARY_PRINTF
> -extern int
> -seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
> +__printf(2, 0)
> +int seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
>  #endif
>  
>  void seq_buf_do_printk(struct seq_buf *s, const char *lvl);