linux-kernel - Re: [PATCH v3 05/15] arm64: Don't use disable_nonboot

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Message-ID: <20200320140741.f37mtomvr5wb6cct@e107158-lin.cambridge.arm.com>
Date:   Fri, 20 Mar 2020 14:07:41 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 05/15] arm64: Don't use disable_nonboot_cpus()

On 03/17/20 11:21, Catalin Marinas wrote:
> On Sun, Feb 23, 2020 at 07:29:32PM +0000, Qais Yousef wrote:
> > disable_nonboot_cpus() is not safe to use when doing machine_down(),
> > because it relies on freeze_secondary_cpus() which in turn is
> > a suspend/resume related freeze and could abort if the logic detects any
> > pending activities that can prevent finishing the offlining process.
> > 
> > Beside disable_nonboot_cpus() is dependent on CONFIG_PM_SLEEP_SMP which
> > is an othogonal config to rely on to ensure this function works
> > correctly.
> > 
> > Use `reboot_cpu` variable instead of hardcoding 0 as the reboot cpu.
> > 
> > Signed-off-by: Qais Yousef <qais.yousef@....com>
> > CC: Catalin Marinas <catalin.marinas@....com>
> > CC: Will Deacon <will@...nel.org>
> > CC: linux-arm-kernel@...ts.infradead.org
> > CC: linux-kernel@...r.kernel.org
> 
> I'm not sure whether these patches have been queued already (still
> unread in my inbox), so here it is:
> 
> Acked-by: Catalin Marinas <catalin.marinas@....com>

Thanks Catalin!

Russel has requested to split the arm patch into 2 so that the change to
use reboot_cpu is in a separate patch. I'll do the same for arm64 to stay
consistent. I'll add your Acked-by to both patches if that's okay.

Please shout if you have any objection.

Thanks

--
Qais Yousef