From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756234Ab3HFLtU (ORCPT ); Tue, 6 Aug 2013 07:49:20 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:44958 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756157Ab3HFLtQ (ORCPT ); Tue, 6 Aug 2013 07:49:16 -0400 From: Raghavendra K T To: , , , , , , Cc: linux-doc@vger.kernel.org, , Raghavendra K T , , , , , , , , , , , , , , , , , , , Date: Tue, 06 Aug 2013 17:12:24 +0530 Message-Id: <20130806114224.20643.9099.sendpatchset@codeblue.in.ibm.com> In-Reply-To: <20130806114020.20643.57235.sendpatchset@codeblue.in.ibm.com> References: <20130806114020.20643.57235.sendpatchset@codeblue.in.ibm.com> Subject: [PATCH V12 6/14] xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13080611-3620-0000-0000-000003D3D9BD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks From: Jeremy Fitzhardinge Signed-off-by: Jeremy Fitzhardinge Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: Raghavendra K T Acked-by: Ingo Molnar --- arch/x86/xen/spinlock.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index a458729..669a971 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -244,6 +244,8 @@ void xen_uninit_lock_cpu(int cpu) per_cpu(irq_name, cpu) = NULL; } +static bool xen_pvspin __initdata = true; + void __init xen_init_spinlocks(void) { /* @@ -253,10 +255,22 @@ void __init xen_init_spinlocks(void) if (xen_hvm_domain()) return; + 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;