linux-kernel - Re: [RFC PATCH v3 00/12] Unify SMP stop generic logic to common code

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Message-ID: <20200113164029.GE4458@willie-the-truck>
Date:   Mon, 13 Jan 2020 16:40:29 +0000
From:   Will Deacon <will@...nel.org>
To:     Cristian Marussi <cristian.marussi@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        mark.rutland@....com, peterz@...radead.org,
        catalin.marinas@....com, takahiro.akashi@...aro.org,
        james.morse@....com, hidehiro.kawai.ez@...achi.com,
        tglx@...utronix.de, linux-arm-kernel@...ts.infradead.org,
        mingo@...hat.com, x86@...nel.org, dzickus@...hat.com,
        ehabkost@...hat.com, linux@...linux.org.uk, davem@...emloft.net,
        sparclinux@...r.kernel.org, hch@...radead.org
Subject: Re: [RFC PATCH v3 00/12] Unify SMP stop generic logic to common code

On Thu, Dec 19, 2019 at 12:18:53PM +0000, Cristian Marussi wrote:
> the logic underlying SMP stop and kexec crash procedures, beside containing
> some arch-specific bits, is mostly generic and common across all archs:
> despite this fact, such logic is now scattered across all architectures and
> on some of them is flawed, in such a way that, under some specific
> conditions, you can end up with a CPU left still running after a panic and
> possibly lost across a subsequent kexec crash reboot. [1]

Is this still the case even after 20bb759a66be ("panic: ensure preemption is
disabled during panic()")?

Will