Re: [PATCH] iwl4965: Enable checking of format strings
From: Rustad, Mark D
Date: Wed Feb 11 2015 - 19:41:53 EST
On Feb 11, 2015, at 2:51 PM, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> wrote:
> Since these fmt_* variables are just const char*, and not const
> char, gcc (and smatch) doesn't to type checking of the arguments to
> the printf functions. Since the linker knows perfectly well to merge
> identical string constants, there's no point in having three static
> pointers waste memory and give an extra level of indirection.
> This removes over 100 "non-constant format argument" warnings from
> smatch, accounting for about 20% of all such warnings in an
> Signed-off-by: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
> drivers/net/wireless/iwlegacy/4965-debug.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
> diff --git a/drivers/net/wireless/iwlegacy/4965-debug.c b/drivers/net/wireless/iwlegacy/4965-debug.c
> index e0597bfdddb8..18855325cc1c 100644
> --- a/drivers/net/wireless/iwlegacy/4965-debug.c
> +++ b/drivers/net/wireless/iwlegacy/4965-debug.c
> @@ -28,10 +28,9 @@
> #include "common.h"
> #include "4965.h"
> -static const char *fmt_value = " %-30s %10u\n";
> -static const char *fmt_table = " %-30s %10u %10u %10u %10u\n";
> -static const char *fmt_header =
> - "%-32s current cumulative delta max\n";
Why not change these to:
static const char fmt_value = " %-30s %10u\n";
static const char fmt_table = " %-30s %10u %10u %10u %10u\n";
static const char fmt_header =
"%-32s current cumulative delta max\n";
I think that is better than the macros and avoids the extra pointers that I agree are useless.
Mark Rustad, Networking Division, Intel Corporation
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