linux-kernel - Re: [PATCH perf/core 2/8] [BUGFIX] perf probe: Remove all probes matches given pattern at once

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Date:	Wed, 22 Apr 2015 21:27:52 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH perf/core 2/8] [BUGFIX] perf probe: Remove all probes
 matches given pattern at once

(2015/04/22 16:33), Namhyung Kim wrote:
> Hi Masami,
> 
> On Tue, Apr 21, 2015 at 08:42:00PM +0900, Masami Hiramatsu wrote:
>> @@ -2760,14 +2762,17 @@ int del_perf_probe_events(struct strlist *dellist)
>>  
>>  		pr_debug("Group: %s, Event: %s\n", group, event);
>>  
>> +		ret = ret2 = -ENOENT;
>>  		if (namelist)
>>  			ret = del_trace_probe_event(kfd, buf, namelist);
>>  
>> -		if (unamelist && ret != 0)
>> -			ret = del_trace_probe_event(ufd, buf, unamelist);
>> +		if (unamelist)
>> +			ret2 = del_trace_probe_event(ufd, buf, unamelist);
>>  
>> -		if (ret != 0)
>> -			pr_info("Info: Event \"%s\" does not exist.\n", buf);
>> +		/* Since we can remove probes which already removed, no error  */
>> +		if (ret != 0 && ret2 != 0)
>> +			pr_debug("Event \"%s\" does not exist.\n", buf);
> 
> I think it'd be better checking 'ret == -ENOENT && ret2 == -ENOENT'
> here since del_trace_probe_event() can return other error codes.

Indeed. BTW, this code is replaced by patch 5/8, so I'll update it too.

Thanks!


-- 
Masami HIRAMATSU
Linux Technology Research Center, System Productivity Research Dept.
Center for Technology Innovation - Systems Engineering
Hitachi, Ltd., Research & Development Group
E-mail: masami.hiramatsu.pt@...achi.com


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