linux-kernel - Re: [RFC][PATCH] cpu/hotplug: wait for cpuset_hotplug

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Message-ID: <87k0trvig0.fsf@oracle.com>
Date:   Tue, 08 Dec 2020 21:09:35 -0500
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Alexey Klimov <aklimov@...hat.com>, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org
Cc:     peterz@...radead.org, yury.norov@...il.com, tglx@...utronix.de,
        jobaker@...hat.com, audralmitchel@...il.com, arnd@...db.de,
        gregkh@...uxfoundation.org, rafael@...nel.org, tj@...nel.org,
        lizefan@...wei.com, qais.yousef@....com, hannes@...xchg.org,
        klimov.linux@...il.com
Subject: Re: [RFC][PATCH] cpu/hotplug: wait for cpuset_hotplug_work to
 finish on cpu online

Alexey Klimov <aklimov@...hat.com> writes:
> I also in doubts if we need cpuset_wait_for_hotplug() in cpuhp_online_cpu_device()
> since an online uevent is sent there too.

We do need it there if we go with this fix.  Your reproducer hits the
same issue when it's changed to exercise smt/control instead of
cpuN/online.