Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Subject: Re: [PATCH 1/4] perf trace-event-info: Add tracepoint_id_to_name()
 helper
To:     Adrian Hunter <adrian.hunter@intel.com>, <peterz@infradead.org>,
        <mingo@redhat.com>, <acme@kernel.org>, <mark.rutland@arm.com>,
        <alexander.shishkin@linux.intel.com>, <jolsa@kernel.org>,
        <namhyung@kernel.org>, <irogers@google.com>,
        <anshuman.khandual@arm.com>, <jesussanp@google.com>,
        <linux-perf-users@vger.kernel.org>, <linux-kernel@vger.kernel.org>
References: <20230419122912.73746-1-yangjihong1@huawei.com>
 <20230419122912.73746-2-yangjihong1@huawei.com>
 <07770bac-cbeb-170e-b3c1-d0276d4ffef3@intel.com>
From:   Yang Jihong <yangjihong1@huawei.com>
Message-ID: <6d03b9cc-31c8-37c3-3e82-504be8712dee@huawei.com>
Date:   Wed, 10 May 2023 16:09:37 +0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101
 Thunderbird/78.6.1
MIME-Version: 1.0
In-Reply-To: <07770bac-cbeb-170e-b3c1-d0276d4ffef3@intel.com>
Content-Type: text/plain; charset="utf-8"; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

Hello,

On 2023/5/10 15:48, Adrian Hunter wrote:
> On 19/04/23 15:29, Yang Jihong wrote:
>> Add tracepoint_id_to_name() helper to search for the trace events directory
>> by given event id and return the corresponding tracepoint.
>>
>> Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
>> ---
>>   tools/perf/util/trace-event-info.c | 13 +++++++++++++
>>   tools/perf/util/trace-event.h      |  6 ++++++
>>   2 files changed, 19 insertions(+)
>>
>> diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
>> index c24b3a15e319..79907caaf0ca 100644
>> --- a/tools/perf/util/trace-event-info.c
>> +++ b/tools/perf/util/trace-event-info.c
>> @@ -466,6 +466,19 @@ static struct tracepoint_path *tracepoint_id_to_path(u64 config)
>>   	return NULL;
>>   }
>>   
>> +char *tracepoint_id_to_name(u64 config)
>> +{
>> +	char buf[MAX_EVENT_LENGTH];
>> +	struct tracepoint_path *path = NULL;
> 
> Initializer should be tracepoint_id_to_path(config) i.e.
> 
OK, will fix in next version.

> 	struct tracepoint_path *path = tracepoint_id_to_path(config);
> 
>> +
>> +	path = tracepoint_id_to_path(config);
>> +	if (path == NULL)
>> +		return NULL;
>> +
>> +	snprintf(buf, sizeof(buf), "%s:%s", path->system, path->name);
> 
> asprintf() can be used then buf and strdup() are not needed.
> 
OK, will fix in next version.

Thanks for correcting.

Thanks,
Yang