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Message-ID: <20151125115336.GF20439@e106622-lin> Date: Wed, 25 Nov 2015 11:53:36 +0000 From: Juri Lelli <juri.lelli@....com> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: LKML <linux-kernel@...r.kernel.org>, ALKML <linux-arm-kernel@...ts.infradead.org> Subject: Re: suspicious RCU usage on 4.4-rc2 ARM platform On 24/11/15 08:52, Paul E. McKenney wrote: > On Tue, Nov 24, 2015 at 04:27:50PM +0000, Juri Lelli wrote: > > Hi Paul, > > > > I'm hitting these splats while running simple hotplug tests on an ARM > > TC2 platform. The following seems to cure it, but I don't think it never > > made it to mainline: > > > > https://lkml.org/lkml/2015/5/12/892 > > > > Any reason why? > > If I remember correctly, it could result in failures on some ARM > processors. The problem was that this patch assumes that the CPU > caches remain active throughout, when in fact they can be disabled at an > inconvenient time. As I understand it, this can result in other updates > to that cache line being lost when the CPU is powered off. > > RMK would know more. > Paul, Russell, thanks for confirming that this is a know problem; I just wanted to be sure I'm not seeing something new. I guess I'll keep using this fix on my box while I wait for a proper one. Best, - Juri -- 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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