Message-ID: <54F04B42.1@huawei.com>
Date: Fri, 27 Feb 2015 18:47:30 +0800
From: Yunlong Song <yunlong.song@huawei.com>
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To: Ingo Molnar <mingo@kernel.org>
CC: <a.p.zijlstra@chello.nl>, <paulus@samba.org>, <mingo@redhat.com>,
        <acme@kernel.org>, <linux-kernel@vger.kernel.org>,
        <wangnan0@huawei.com>
Subject: Re: [PATCH] perf record: Remove the '--(null)' long_name for --list-opts
References: <1424087904-3246-1-git-send-email-yunlong.song@huawei.com> <20150218175610.GA31995@gmail.com>
In-Reply-To: <20150218175610.GA31995@gmail.com>
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On 2015/2/19 1:56, Ingo Molnar wrote:
> 
> * Yunlong Song <yunlong.song@huawei.com> wrote:
> 
>> If the long_name of a 'struct option' is defined as NULL, --list-opts
>> will incorrectly print '--(null)' in its output. As a result, '--(null)'
>> will finally appear in the case of bash completion, e.g. 'perf record --'.
>>
>> Example:
>>
>> Before this patch:
>>
>>  $ perf record --list-opts
>>
>>  --event --filter --pid --tid --realtime --no-buffering --raw-samples
>>  --all-cpus --cpu --count --output --no-inherit --freq --mmap-pages
>>  --group --(null) --call-graph --verbose --quiet --stat --data
>>  --timestamp --period --no-samples --no-buildid-cache --no-buildid
>>  --cgroup --delay --uid --branch-any --branch-filter --weight
>>  --transaction --per-thread --intr-regs
>>
>> After this patch:
>>
>>  $ perf record --list-opts
>>
>>  --event --filter --pid --tid --realtime --no-buffering --raw-samples
>>  --all-cpus --cpu --count --output --no-inherit --freq --mmap-pages
>>  --group --call-graph --verbose --quiet --stat --data --timestamp
>>  --period --no-samples --no-buildid-cache --no-buildid --cgroup --delay
>>  --uid --branch-any --branch-filter --weight --transaction --per-thread
>>  --intr-regs
>>
>> Signed-off-by: Yunlong Song <yunlong.song@huawei.com>
>> ---
>>  tools/perf/util/parse-options.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
>> index 4ee9a86..2bfe0b3 100644
>> --- a/tools/perf/util/parse-options.c
>> +++ b/tools/perf/util/parse-options.c
>> @@ -505,7 +505,8 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
>>  		break;
>>  	case PARSE_OPT_LIST_OPTS:
>>  		while (options->type != OPTION_END) {
>> -			printf("--%s ", options->long_name);
>> +			if (options->long_name)
>> +				printf("--%s ", options->long_name);
> 
> There seems to be another 'perf record --list-opts' bug as 
> well:
> 
> comet:~/tip> perf record --list-opts
> --event --filter --pid --tid --realtime --no-buffering 
> --raw-samples --all-cpus --cpu --count --output 
> --no-inherit --freq --mmap-pages --group --(null) 
> --call-graph --verbose --quiet --stat --data --timestamp 
> --period --no-samples --no-buildid-cache --no-buildid 
> --cgroup --delay --uid --branch-any --branch-filter 
> --weight --transaction --per-thread --intr-regs comet:~/tip> 
> 
> Note the lack of newline at the end of the printout.
> 
> Thanks,
> 
> 	Ingo
> 
> .
> 

I have put this patch into my new patchset, see:

http://lkml.org/lkml/2015/2/27/139   [PATCH v3 6/7],

and the new patchset has already fixed the problem of 'lack of newline
at the end of the printout', see:

http://lkml.org/lkml/2015/2/27/140   [PATCH v3 5/7]

-- 
Thanks,
Yunlong Song

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