linux-kernel - Re: [PATCH 2/4] perf tools: Fix max mmap

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Message-ID: <20131209133529.GA30360@krava.brq.redhat.com>
Date:	Mon, 9 Dec 2013 14:35:29 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/4] perf tools: Fix max mmap_pages

On Mon, Dec 09, 2013 at 03:18:38PM +0200, Adrian Hunter wrote:
> 'SIZE_MAX / page_size' is an upper limit for
> the maximum number of mmap pages, not a lower
> limit.  Change the condition accordingly.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/evlist.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 4d0945c..98ec96b 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -754,7 +754,7 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
>  	unsigned long max = UINT_MAX;
>  	long pages;
>  
> -	if (max < SIZE_MAX / page_size)
> +	if (max > SIZE_MAX / page_size)
>  		max = SIZE_MAX / page_size;

I agree with the change.. but it looks like the check
is superfluos, maybe we want to define max as:

   unsigned long max = SIZE_MAX / page_size

?

jirka
>  
>  	pages = parse_pages_arg(str, 1, max);
> -- 
> 1.7.11.7
> 
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