linux-kernel - Re: [PATCH v2 06/13] perf header: add struct feat

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Date:   Sun, 4 Jun 2017 18:50:49 -0700
From:   David Carrillo-Cisneros <davidcc@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v2 06/13] perf header: add struct feat_fd for write

On Thu, May 25, 2017 at 1:07 AM, Jiri Olsa <jolsa@...hat.com> wrote:
> On Tue, May 23, 2017 at 12:48:46AM -0700, David Carrillo-Cisneros wrote:
>
> SNIP
>
>> @@ -2211,18 +2214,18 @@ static int do_write_feat(int fd, struct perf_header *h, int type,
>>               if (!feat_ops[type].write)
>>                       return -1;
>>
>> -             (*p)->offset = lseek(fd, 0, SEEK_CUR);
>> +             (*p)->offset = lseek(fd->fd, 0, SEEK_CUR);
>>
>> -             err = feat_ops[type].write(fd, h, evlist);
>> +             err = feat_ops[type].write(fd, evlist);
>>               if (err < 0) {
>>                       pr_debug("failed to write feature %s\n", feat_ops[type].name);
>>
>>                       /* undo anything written */
>> -                     lseek(fd, (*p)->offset, SEEK_SET);
>> +                     lseek(fd->fd, (*p)->offset, SEEK_SET);
>>
>>                       return -1;
>>               }
>> -             (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
>> +             (*p)->size = lseek(fd->fd, 0, SEEK_CUR) - (*p)->offset;
>>               (*p)++;
>>       }
>>       return ret;
>> @@ -2232,12 +2235,18 @@ static int perf_header__adds_write(struct perf_header *header,
>>                                  struct perf_evlist *evlist, int fd)
>>  {
>>       int nr_sections;
>> +     struct feat_fd fdd;
>>       struct perf_file_section *feat_sec, *p;
>>       int sec_size;
>>       u64 sec_start;
>>       int feat;
>>       int err;
>>
>> +     fdd = (struct feat_fd){
>> +             .fd  = fd,
>> +             .ph = header,
>> +     };
>
> could you unite the naming for struct feat_fd variables?
>
> it's slightly confusing, especialy when you keep the 'fd'
> name in some cases.. ff? ;-)
>
Thank you for the review :) . I'll do the rename.

> jirka