linux-kernel - Re: [PATCH] perf tests: Fix compile failure on do_sort_something

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Date:	Wed, 14 Aug 2013 14:05:52 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	David Ahern <dsahern@...il.com>
CC:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf tests: Fix compile failure on do_sort_something
 - v2

On 14/08/13 07:32, David Ahern wrote:
> Commit b55ae0a9 added code-reading.c which fails to compile on Fedora 16
> with compiler version:
> $ gcc --version
> gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)
> 
> Failure message is:
> 
> tests/code-reading.c: In function ‘do_sort_something’:
> tests/code-reading.c:305:13: error: stack protector not protecting local variables: variable length buffer [-Werror=stack-protector]
> cc1: all warnings being treated as errors
> make: *** [/tmp/junk/tests/code-reading.o] Error 1
> make: *** Waiting for unfinished jobs....
> 
> v2: as Adrian noticed changed sizeof to ARRAY_SIZE
> 
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Jiri Olsa <jolsa@...hat.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>


> ---
>  tools/perf/tests/code-reading.c |   11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
> index eec1421..df9afd9 100644
> --- a/tools/perf/tests/code-reading.c
> +++ b/tools/perf/tests/code-reading.c
> @@ -304,15 +304,14 @@ static int comp(const void *a, const void *b)
>  
>  static void do_sort_something(void)
>  {
> -	size_t sz = 40960;
> -	int buf[sz], i;
> +	int buf[40960], i;
>  
> -	for (i = 0; i < (int)sz; i++)
> -		buf[i] = sz - i - 1;
> +	for (i = 0; i < (int)ARRAY_SIZE(buf); i++)
> +		buf[i] = ARRAY_SIZE(buf) - i - 1;
>  
> -	qsort(buf, sz, sizeof(int), comp);
> +	qsort(buf, ARRAY_SIZE(buf), sizeof(int), comp);
>  
> -	for (i = 0; i < (int)sz; i++) {
> +	for (i = 0; i < (int)ARRAY_SIZE(buf); i++) {
>  		if (buf[i] != i) {
>  			pr_debug("qsort failed\n");
>  			break;
> 

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