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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
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