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Date: Tue, 6 Sep 2011 17:41:47 +0100 From: <stefano.stabellini@...citrix.com> To: konrad.wilk@...cle.com CC: linux-kernel@...r.kernel.org, Stefano.Stabellini@...citrix.com, xen-devel@...ts.xensource.com, Stefano Stabellini <stefano.stabellini@...citrix.com> Subject: [PATCH] xen: disable PV spinlocks on HVM From: Stefano Stabellini <stefano.stabellini@...citrix.com> PV spinlocks cannot possibly work with the current code because they are enabled after pvops patching has already been done, and because PV spinlocks use a different data structure than native spinlocks so we cannot switch between them dynamically. A spinlock that has been taken once by the native code (__ticket_spin_lock) cannot be taken by __xen_spin_lock even after it has been released. Reported-by: Stefan Bader <stefan.bader@...onical.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com> --- arch/x86/xen/smp.c | 1 - 1 files changed, 0 insertions(+), 1 deletions(-) diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index e79dbb9..51339b4 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -522,7 +522,6 @@ static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus) WARN_ON(xen_smp_intr_init(0)); xen_init_lock_cpu(0); - xen_init_spinlocks(); } static int __cpuinit xen_hvm_cpu_up(unsigned int cpu) -- 1.7.2.3 -- 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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