From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752253Ab1JMAx5 (ORCPT ); Wed, 12 Oct 2011 20:53:57 -0400 Received: from claw.goop.org ([74.207.240.146]:47345 "EHLO claw.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751963Ab1JMAvt (ORCPT ); Wed, 12 Oct 2011 20:51:49 -0400 From: Jeremy Fitzhardinge To: "H. Peter Anvin" Cc: Linus Torvalds , Peter Zijlstra , Ingo Molnar , the arch/x86 maintainers , Linux Kernel Mailing List , Nick Piggin , Avi Kivity , Marcelo Tosatti , KVM , Andi Kleen , Xen Devel , Jeremy Fitzhardinge Subject: [PATCH RFC V5 06/11] xen/pvticketlocks: add xen_nopvspin parameter to disable xen pv ticketlocks Date: Wed, 12 Oct 2011 17:51:38 -0700 Message-Id: <58ca1ea5c2cd3a0d6ee6d20fae17bf4a813e8b06.1318466916.git.jeremy.fitzhardinge@citrix.com> X-Mailer: git-send-email 1.7.6.4 In-Reply-To: References: In-Reply-To: References: 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 --- 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 f6133c5..1e21c99 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -195,12 +195,26 @@ 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; -- 1.7.6.4