linux-kernel - Re: [PATCH -v1.2] trace/function-graph: Fix build warning on 32-bit

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Date:	Wed, 29 Sep 2010 15:40:24 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Chase Douglas <chase.douglas@...onical.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v1.2] trace/function-graph: Fix build warning on 32-bit

On Wed, Sep 29, 2010 at 10:08:23AM +0200, Borislav Petkov wrote:
> > Fix
> > 
> > kernel/trace/trace_functions_graph.c: In function ‘trace_print_graph_duration’:
> > kernel/trace/trace_functions_graph.c:652: warning: comparison of distinct pointer types lacks a cast
> 
> sh*t, I got completely carried away with all that typechecking, take
> this one instead:
> 
> --


Queued, thanks!



> From: Borislav Petkov <bp@...en8.de>
> Date: Wed, 29 Sep 2010 08:39:43 +0200
> Subject: [PATCH] trace/function-graph: Fix build warning on 32-bit
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
> 
> Fix
> 
> kernel/trace/trace_functions_graph.c: In function ‘trace_print_graph_duration’:
> kernel/trace/trace_functions_graph.c:652: warning: comparison of distinct pointer types lacks a cast
> 
> when building 36-rc6 on a 32-bit due to the strict type check failing in
> the min() macro.
> 
> Signed-off-by: Borislav Petkov <bp@...en8.de>
> ---
>  kernel/trace/trace_functions_graph.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
> index 6f23369..82306cc 100644
> --- a/kernel/trace/trace_functions_graph.c
> +++ b/kernel/trace/trace_functions_graph.c
> @@ -649,8 +649,9 @@ trace_print_graph_duration(unsigned long long duration, struct trace_seq *s)
>  
>  	/* Print nsecs (we don't want to exceed 7 numbers) */
>  	if (len < 7) {
> -		snprintf(nsecs_str, min(sizeof(nsecs_str), 8UL - len), "%03lu",
> -			 nsecs_rem);
> +		size_t slen = min_t(size_t, sizeof(nsecs_str), 8UL - len);
> +
> +		snprintf(nsecs_str, slen, "%03lu", nsecs_rem);
>  		ret = trace_seq_printf(s, ".%s", nsecs_str);
>  		if (!ret)
>  			return TRACE_TYPE_PARTIAL_LINE;
> -- 
> 1.7.2.3
> 
> -- 
> Regards/Gruss,
>     Boris.

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