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From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Tue, 10 Feb 2015 14:20:24 +0100
Message-ID: <CAK1hOcOC980BL7jT_PudPNMx1Vc2t-Li68K5hBnuFKaAZi2PfQ@mail.gmail.com>
Subject: Re: [PATCH] x86 spinlock: Fix memory corruption on completing completions
To: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Jeremy Fitzhardinge <jeremy@goop.org>,
        Sasha Levin <sasha.levin@oracle.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Peter Anvin <hpa@zytor.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Paul McKenney <paulmck@linux.vnet.ibm.com>,
        Waiman Long <waiman.long@hp.com>, Dave Jones <davej@redhat.com>,
        Oleg Nesterov <oleg@redhat.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Andi Kleen <ak@linux.intel.com>, Jason Wang <jasowang@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        KVM list <kvm@vger.kernel.org>,
        virtualization <virtualization@lists.linux-foundation.org>,
        xen-devel <xen-devel@lists.xenproject.org>,
        Rik van Riel <riel@redhat.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrey Ryabinin <a.ryabinin@samsung.com>
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On Tue, Feb 10, 2015 at 2:18 PM, Denys Vlasenko
<vda.linux@googlemail.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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