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

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Message-ID: <20211129110755.616133df@gandalf.local.home>
Date:   Mon, 29 Nov 2021 11:07:55 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     Sven Schnelle <svens@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        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>,
        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>
Subject: Re: [PATCH v2 7/7] tools/testing/selftests/bpf: replace open-coded
 16 with TASK_COMM_LEN

On Mon, 29 Nov 2021 23:33:33 +0800
Yafang Shao <laoar.shao@...il.com> wrote:

> > TBH, i would vote for reverting the change. defining an array size as
> > enum feels really odd.
> >  
> 
> We changed it to enum because the BTF can't parse macro while it can
> parse the enum type.

I wonder if BTF could take advantage of the tracing:

TRACE_DEFINE_ENUM() macros?

This is how they are converted for user space tooling.

Anyway, I'd have to go and look at why that trigger test failed. I don't
see how the size of the array caused it to change the signage of value.

-- Steve


> Anyway I don't insist on keeping this change if you think reverting it
> is better.