linux-kernel - Re: [PATCH] perf tools: makes CPUINFO_PROC to array for different kernel version

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Date:	Wed, 22 Oct 2014 15:44:18 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Waiman Long <Waiman.Long@...com>,
	<linux-kernel@...r.kernel.org>, Li Zefan <lizefan@...wei.com>
Subject: Re: [PATCH] perf tools: makes CPUINFO_PROC to array for different kernel version

Hi Wang,

On Thu, 16 Oct 2014 11:08:43 +0800, Wang Nan wrote:
> After kerne 3.7 (commit b4b8f770eb10a1bccaf8aa0ec1956e2dd7ed1e0a),
> /proc/cpuinfo replcae 'Processor' to 'model name'. This patch makes
> CPUINFO_PROC to an array and provides two choices for ARM, make it
> compatible for different kernel version.
>
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> -static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
> -		       struct perf_evlist *evlist __maybe_unused)
> +static int __write_cpudesc(int fd, struct perf_header *h __maybe_unused,
> +		       struct perf_evlist *evlist __maybe_unused, const char *cpuinfo_proc)

You don't need to pass @h and @evlist if they're not used.


>  {
> -#ifndef CPUINFO_PROC
> -#define CPUINFO_PROC NULL
> -#endif
>  	FILE *file;
>  	char *buf = NULL;
>  	char *s, *p;
> -	const char *search = CPUINFO_PROC;
> +	const char *search = cpuinfo_proc;
>  	size_t len = 0;
>  	int ret = -1;
>  
> @@ -640,6 +637,23 @@ done:
>  	return ret;
>  }
>  
> +static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
> +		       struct perf_evlist *evlist __maybe_unused)
> +{
> +#ifndef CPUINFO_PROC
> +#define CPUINFO_PROC {"model name", }
> +#endif
> +	const char *cpuinfo_procs[] = CPUINFO_PROC;
> +	unsigned int i;

Please put a blank line between declaration and the function body.

Other than that, looks good to me.

Thanks,
Namhyung


> +	for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
> +		int ret;
> +		ret = __write_cpudesc(fd, h, evlist, cpuinfo_procs[i]);
> +		if (ret >= 0)
> +			return ret;
> +	}
> +	return -1;
> +}
> +
>  static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
>  			struct perf_evlist *evlist __maybe_unused)
>  {
--
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