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Message-ID: <52a9f138-45f0-ca05-b67a-d734663984df@efficios.com>
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>,
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LKML <linux-kernel@...r.kernel.org>,
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Andrii Nakryiko <andrii@...nel.org>,
David Hildenbrand <david@...hat.com>,
Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
Andrii Nakryiko <andrii.nakryiko@...il.com>,
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Qais Yousef <qyousef@...gle.com>,
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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
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