On Wed, 2015-09-30 at 17:30 +0200, Rasmus Villemoes wrote:
> As a quick
>
> git grep -E '%[ +0#-]*#[ +0#-]*(\*|[0-9]+)?(\.(\*|[0-9]+)?)?p'
>
> shows, nobody uses the # flag with %p. Should one try to do so, one
> will be met with
>
> warning: `#' flag used with ‘%p’ gnu_printf format [-Wformat]
>
> (POSIX and C99 both say "... For other conversion specifiers, the
> behavior is undefined.". Obviously, the kernel can choose to define
> the behaviour however it wants, but as long as gcc issues that
> warning, users are unlikely to show up.)
>
> Since default_width is effectively always 2*sizeof(void*), we can
> simplify the prologue of pointer() and save a few instructions.
>
Reviewed-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
> Signed-off-by: Rasmus Villemoes <li...@rasmusvillemoes.dk>
> ---
> v2: reword slightly, refer to POSIX/C99.
>
> lib/vsprintf.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index 03fa10b4be96..98b0d7be3fb7 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -1457,7 +1457,7 @@ static noinline_for_stack
> char *pointer(const char *fmt, char *buf, char *end, void *ptr,
> struct printf_spec spec)
> {
> - int default_width = 2 * sizeof(void *) + (spec.flags &
> SPECIAL ? 2 : 0);
> + const int default_width = 2 * sizeof(void *);
>
> if (!ptr && *fmt != 'K') {
> /*
--
Andy Shevchenko <andriy.shevche...@linux.intel.com>
Intel Finland Oy
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