linux-kernel - Re: [PATCH] perf: fix bench numa compilation

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Date:	Mon, 17 Jun 2013 17:55:43 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Riccardo Magliocchetti <riccardo.magliocchetti@...il.com>
Cc:	acme@...stprotocols.net, mingo@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: fix bench numa compilation

Hi Riccardo,

On Sat, 15 Jun 2013 12:15:14 +0200, Riccardo Magliocchetti wrote:
> bench/numa.c: In function ‘worker_thread’:
> bench/numa.c:1113:20: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
>     if (diff.tv_sec >= g->p.nr_secs) {
>                     ^
> bench/numa.c:1161:6: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 5 has type ‘u64’ [-Werror=format=]
>       process_nr, thread_nr, runtime_ns_max / bytes_done, val);
>       ^
>
> Signed-off-by: Riccardo Magliocchetti <riccardo.magliocchetti@...il.com>
> ---
>  tools/perf/bench/numa.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> Diffed against 3.9.6 but should apply cleanly to latest git
>
> diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c
> index 30d1c32..90ef4cc 100644
> --- a/tools/perf/bench/numa.c
> +++ b/tools/perf/bench/numa.c
> @@ -1110,7 +1110,7 @@ static void *worker_thread(void *__tdata)
>  		/* Check whether our max runtime timed out: */
>  		if (g->p.nr_secs) {
>  			timersub(&stop, &start0, &diff);
> -			if (diff.tv_sec >= g->p.nr_secs) {
> +			if (diff.tv_sec >= (long int)g->p.nr_secs) {
>  				g->stop_work = true;
>  				break;
>  			}
> @@ -1157,7 +1157,7 @@ static void *worker_thread(void *__tdata)
>  			runtime_ns_max += diff.tv_usec * 1000;
>  
>  			if (details >= 0) {
> -				printf(" #%2d / %2d: %14.2lf nsecs/op [val: %016lx]\n",
> +				printf(" #%2d / %2d: %14.2lf nsecs/op [val: %016llx]\n",
>  					process_nr, thread_nr, runtime_ns_max / bytes_done, val);
>  			}
>  			fflush(stdout);

It will fail to build on 64 bit machines:

bench/numa.c: In function ‘worker_thread’:
bench/numa.c:1161:6: error: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 5 has type ‘u64’ [-Werror=format]
cc1: all warnings being treated as errors
make: *** [bench/numa.o] Error 1


You can use PRIx64 or cast val to unsigned long long type explicitly.

Thanks,
Namhyung
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