linux-kernel - Re: [PATCH (REPOST)] profiling: initialize prof_cpu_mask from profile_online

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Message-ID: <a4586446-2318-4220-8610-0d5a99e0ad6c@I-love.SAKURA.ne.jp>
Date: Fri, 10 May 2024 20:25:22 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Hugh Dickins <hughd@...gle.com>, Ingo Molnar <mingo@...hat.com>,
        akpm@...ux-foundation.org
Cc: tglx@...utronix.de, paskripkin@...il.com, rostedt@...dmis.org,
        glider@...gle.com, ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com,
        syzbot <syzbot+b1a83ab2a9eb9321fbdd@...kaller.appspotmail.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH (REPOST)] profiling: initialize prof_cpu_mask from
 profile_online_cpu()

On 2024/05/05 15:18, Tetsuo Handa wrote:
> On 2024/04/27 15:51, Tetsuo Handa wrote:
>> Can somebody test this patch? I don't know how not using
>> cpu_possible_mask affects expected profile data collection
>> (especially when written to /sys/kernel/profiling interface
>> when some of CPUs are offline).
> 
> I confirmed that writing to /sys/kernel/profiling while some of
> /sys/devices/system/cpu/cpu$num/online are 0 will not affect profile data
> collection, for profile_online_cpu() is called (and corresponding bit is set)
> when /sys/devices/system/cpu/cpu$num/online becomes 1. Thus, I consider that
> this patch itself is correct and safe.

Can someone take this patch and
https://lkml.kernel.org/r/20230423012744.24320-1-chenzhongjin@huawei.com ?
These bugs remain unfixed due to lack of someone who can take patches...