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Date: Thu, 26 Jul 2012 18:38:49 +0900 From: Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com> To: suresh.b.siddha@...el.com Cc: tglx@...utronix.de, mingo@...nel.org, hpa@...or.com, yinghai@...nel.org, agordeev@...hat.com, x86@...nel.org, linux-kernel@...r.kernel.org, yrl.pp-manager.tt@...achi.com Subject: Re: [PATCH] x86/ioapic: Fix NULL pointer dereference on CPU hotplug after disabling irqs Hi, thanks for your comment. On 2012/07/26 8:28, Siddha, Suresh B wrote: > Tomoki wrote: >> In current Linux, percpu variable `vector_irq' is not always cleared when >> a CPU is offlined. If the cpu that has the disabled irqs in vector_irq is >> hotplugged again, __setup_vector_irq() hits invalid irq vector and may >> crash. >> >> Commit f6175f5bfb4c partially fixes this, but was not enough in >> environments with IOMMU IRQ remapper. > > So, this patch essentially makes the commit f6175f5bfb4c unnecessary, right? > > Can you revert that too as part of this new proposed patch? > > thanks, > suresh OK, I will include a reverse patch of f6175f5bfb4c and resend the patch. Thanks, -- Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com> Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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