From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030729Ab2CUKW1 (ORCPT ); Wed, 21 Mar 2012 06:22:27 -0400 Received: from e28smtp08.in.ibm.com ([122.248.162.8]:35279 "EHLO e28smtp08.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756761Ab2CUKWZ (ORCPT ); Wed, 21 Mar 2012 06:22:25 -0400 From: Raghavendra K T To: "H. Peter Anvin" , Ingo Molnar Cc: Linus Torvalds , Peter Zijlstra , the arch/x86 maintainers , LKML , Avi Kivity , Marcelo Tosatti , KVM , Andi Kleen , Xen Devel , Konrad Rzeszutek Wilk , Virtualization , Jeremy Fitzhardinge , Stephan Diestelhorst , Srivatsa Vaddagiri , Stefano Stabellini , Attilio Rao Date: Wed, 21 Mar 2012 15:51:49 +0530 Message-Id: <20120321102149.473.80864.sendpatchset@codeblue.in.ibm.com> In-Reply-To: <20120321102041.473.61069.sendpatchset@codeblue.in.ibm.com> References: <20120321102041.473.61069.sendpatchset@codeblue.in.ibm.com> Subject: [PATCH RFC V6 6/11] xen/pvticketlocks: add xen_nopvspin parameter to disable xen pv ticketlocks x-cbid: 12032110-2000-0000-0000-000006DB99C5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jeremy Fitzhardinge Signed-off-by: Jeremy Fitzhardinge Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: Raghavendra K T --- arch/x86/xen/spinlock.c | 14 ++++++++++++++ 1 files changed, 14 insertions(+), 0 deletions(-) diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index 0e4d057..5dce49d 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -223,12 +223,26 @@ void xen_uninit_lock_cpu(int cpu) unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL); } +static bool xen_pvspin __initdata = true; + void __init xen_init_spinlocks(void) { + if (!xen_pvspin) { + printk(KERN_DEBUG "xen: PV spinlocks disabled\n"); + return; + } + pv_lock_ops.lock_spinning = xen_lock_spinning; pv_lock_ops.unlock_kick = xen_unlock_kick; } +static __init int xen_parse_nopvspin(char *arg) +{ + xen_pvspin = false; + return 0; +} +early_param("xen_nopvspin", xen_parse_nopvspin); + #ifdef CONFIG_XEN_DEBUG_FS static struct dentry *d_spin_debug;