linux-kernel - Re: [PATCH] perf bpf-loader: Add missing '*' for key_scan

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Date:   Wed, 20 May 2020 18:22:12 +0800
From:   "Wangshaobo (bobo)" <bobo.shaobowang@...wei.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     <cj.chengjian@...wei.com>, <huawei.libin@...wei.com>,
        <xiexiuqi@...wei.com>, <mark.rutland@....com>,
        <guohanjun@...wei.com>, <acme@...nel.org>,
        <alexander.shishkin@...ux.intel.com>, <wangnan0@...wei.com>,
        <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH] perf bpf-loader: Add missing '*' for key_scan_pos


在 2020/5/20 15:05, Jiri Olsa 写道:
> On Wed, May 20, 2020 at 11:32:16AM +0800, Wang ShaoBo wrote:
>> key_scan_pos is a pointer for getting scan position in
>> bpf__obj_config_map() for each BPF map configuration term,
>> but it's misused when error not happened.
>>
>> Fixes: 066dacbf2a32 ("perf bpf: Add API to set values to map entries in a bpf object")
>> Signed-off-by: Wang ShaoBo <bobo.shaobowang@...wei.com>
>> ---
>>   tools/perf/util/bpf-loader.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
>> index 10c187b8b8ea..460056bc072c 100644
>> --- a/tools/perf/util/bpf-loader.c
>> +++ b/tools/perf/util/bpf-loader.c
>> @@ -1225,7 +1225,7 @@ bpf__obj_config_map(struct bpf_object *obj,
>>   out:
>>   	free(map_name);
>>   	if (!err)
>> -		key_scan_pos += strlen(map_opt);
>> +		*key_scan_pos += strlen(map_opt);
> seems good, was there something failing because of this?
>
> Acked-by: Jiri Olsa <jolsa@...hat.com>
>
> thanks,
> jirka

   I found this problem when i checked this code, I think it is

   an implicit question, but if we delete the two line,  the problem

   also no longer exists.

   thanks,

   Wang ShaoBo