linux-kernel - Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16 with TASK_COMM

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Date:   Mon, 13 Feb 2023 12:46:06 -0500
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Namhyung Kim <namhyung@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Yafang Shao <laoar.shao@...il.com>,
        John Stultz <jstultz@...gle.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel test robot <oliver.sang@...el.com>,
        kbuild test robot <lkp@...el.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Michal Miroslaw <mirq-linux@...e.qmqm.pl>,
        Peter Zijlstra <peterz@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        Kajetan Puchalski <kajetan.puchalski@....com>,
        Lukasz Luba <lukasz.luba@....com>,
        Qais Yousef <qyousef@...gle.com>,
        Daniele Di Proietto <ddiproietto@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded 16
 with TASK_COMM_LEN

On 2023-02-13 12:43, Namhyung Kim wrote:
> Hi Steve,
> 
> On Sat, Feb 11, 2023 at 8:07 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>>
>> On Sun, 12 Feb 2023 11:38:52 +0800
>> Yafang Shao <laoar.shao@...il.com> wrote:
>>
>>>> Actually, there are cases that this needs to be a number, as b3bc8547d3be6
>>>> ("tracing: Have TRACE_DEFINE_ENUM affect trace event types as well") made
>>>> it update fields as well as the printk fmt.
>>>>
>>>
>>> It seems that TRACE_DEFINE_ENUM(TASK_COMM_LEN) in the trace events
>>> header files would be a better fix.
>>
>> NACK! I much prefer the proper fix that adds the length.
> 
> Can we just have both enum and macro at the same time?
> I guess the enum would fill the BTF and the macro would provide
> backward compatibility.

This is no need to keep the define. The root cause of the issue is 
addressed by this fix:

https://lore.kernel.org/lkml/20230212154620.4d8fe033@gandalf.local.home/

Thanks,

Mathieu

> 
> Thanks,
> Namhyung

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com