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Date: Thu, 26 Mar 2009 13:21:01 +0530 From: Balbir Singh <balbir@...ux.vnet.ibm.com> To: Piet Delaney <piet.delaney@...silica.com> Cc: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org, Johannes Weiner <jw@...ix.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH} - There appears to be a minor race condition in sched.c * Piet Delaney <piet.delaney@...silica.com> [2009-03-25 20:46:11]: > Ingo, Peter: > > There appears to be a minor race condition in sched.c where > you can get a division by zero. I suspect that it only shows > up when the kernel is compiled without optimization and the code > loads rq->nr_running from memory twice. > > It's part of our SMP stabilization changes that I just posted to: > > git://git.kernel.org/pub/scm/linux/kernel/git/piet/xtensa-2.6.27-smp.git > > I mentioned it to Johannes the other day and he suggested passing it on to you ASAP. > The latest version uses ACCESS_ONCE to get rq->nr_running and then uses that value. I am not sure what version you are talking about, if it is older, you should consider backporting from the current version. -- Balbir -- 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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