linux-kernel - Re: [PATCH] x86 spinlock: Fix memory corruption on completing completions

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Message-ID: <CAK1hOcOC980BL7jT_PudPNMx1Vc2t-Li68K5hBnuFKaAZi2PfQ@mail.gmail.com>
Date:	Tue, 10 Feb 2015 14:20:24 +0100
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Peter Anvin <hpa@...or.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Waiman Long <waiman.long@...com>,
	Dave Jones <davej@...hat.com>, Oleg Nesterov <oleg@...hat.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Jason Wang <jasowang@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	xen-devel <xen-devel@...ts.xenproject.org>,
	Rik van Riel <riel@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Ryabinin <a.ryabinin@...sung.com>
Subject: Re: [PATCH] x86 spinlock: Fix memory corruption on completing completions

On Tue, Feb 10, 2015 at 2:18 PM, Denys Vlasenko
<vda.linux@...glemail.com> wrote:
>         while (1) {
>             if (READ_ONCE(lock->tickets.head) != TICKET_TAIL(val))
>                 cpu_relax();
>         }

Doh.... should be

         while (READ_ONCE(lock->tickets.head) != TICKET_TAIL(val)
             cpu_relax();
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