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

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Message-ID: <CAM9d7chx+azdxfNVVtaC_8eM2a57aBFa3hjh0TvjFt-6Xc7r7w@mail.gmail.com>
Date:   Mon, 13 Feb 2023 09:43:23 -0800
From:   Namhyung Kim <namhyung@...il.com>
To:     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>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.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

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.

Thanks,
Namhyung