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Message-ID: <20140722094425.GC6462@pd.tnic> Date: Tue, 22 Jul 2014 11:44:25 +0200 From: Borislav Petkov <bp@...en8.de> To: Wanpeng Li <wanpeng.li@...ux.intel.com> Cc: "Chen, Gong" <gong.chen@...ux.intel.com>, hpa@...or.com, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>, David Rientjes <rientjes@...gle.com>, Prarit Bhargava <prarit@...hat.com>, Steven Rostedt <srostedt@...hat.com>, Jan Kiszka <jan.kiszka@...mens.com>, Toshi Kani <toshi.kani@...com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] x86, hotplug: fix llc shared map unreleased during cpu hotplug On Tue, Jul 22, 2014 at 05:30:23PM +0800, Wanpeng Li wrote: > On Tue, Jul 22, 2014 at 04:46:41AM -0400, Chen, Gong wrote: > >On Tue, Jul 22, 2014 at 04:04:52PM +0800, Wanpeng Li wrote: > >> Subject: [PATCH v2] x86, hotplug: fix llc shared map unreleased during cpu > >> hotplug > > > >See this link: > >https://lkml.org/lkml/2014/7/17/78 > > Interesting, thanks for your pointing out. Well, we might end up doing both. Yasuaki's patch makes the core numbering stable which makes a lot of sense in and of itself. However, if some code somewhere relies implicitly on the fact that a set bit in LLC mask means that core is online and goes and does stuff on it, Wanpeng's reported splat will happen. So probably we will have to have *stable* core numbers *and* clear the LLC mask in order to be on the safe side of things. Thanks. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. -- -- 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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