linux-kernel - Re: [PATCH] perf: fix building warning on ARM 32.

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Date:	Tue, 16 Dec 2014 13:49:09 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...nel.org, ak@...ux.intel.com, lizefan@...wei.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: fix building warning on ARM 32.

Hi Wang,

On Tue, Dec 16, 2014 at 10:10:10AM +0800, Wang Nan wrote:
> Commit 85c116a6c introduces asprintf() call and matches '%ld' to a u64
> argument, which is incorrect on ARM.
> 
>    CC       /home/wn/util/srcline.o
>  util/srcline.c: In function 'get_srcline':
>  util/srcline.c:297:6: error: format '%ld' expects argument of type 'long int', but argument 4 has type 'u64' [-Werror=format]
>  cc1: all warnings being treated as errors
>  make[1]: *** [/home/wn/util/srcline.o] Error 1

Hmm.. shouldn't it be %PRIu64 instead?

Thanks,
Namhyung


> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> ---
>  tools/perf/util/srcline.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
> index e73b6a5..42cb642 100644
> --- a/tools/perf/util/srcline.c
> +++ b/tools/perf/util/srcline.c
> @@ -294,7 +294,7 @@ out:
>  	}
>  	if (sym) {
>  		if (asprintf(&srcline, "%s+%ld", show_sym ? sym->name : "",
> -					addr - sym->start) < 0)
> +					(long int)(addr - sym->start)) < 0)
>  			return SRCLINE_UNKNOWN;
>  	} else if (asprintf(&srcline, "%s[%lx]", dso->short_name, addr) < 0)
>  		return SRCLINE_UNKNOWN;
> -- 
> 1.8.4
> 
> --
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