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

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Date:	Wed, 22 Oct 2014 15:49:09 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	Namhyung Kim <namhyung@...nel.org>
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

On 2014/10/22 14:44, Namhyung Kim wrote:
> 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
> 

I posted a v2 patch, please refer to https://lkml.org/lkml/2014/10/22/85 .

Thanks.

> 
>> +	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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