From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752702Ab3FXMiM (ORCPT ); Mon, 24 Jun 2013 08:38:12 -0400 Received: from e28smtp04.in.ibm.com ([122.248.162.4]:54823 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752566Ab3FXMiH (ORCPT ); Mon, 24 Jun 2013 08:38:07 -0400 From: Raghavendra K T To: , , , , , , Cc: linux-doc@vger.kernel.org, , Raghavendra K T , , , , , , , , , , , , , , , , , , , , Date: Mon, 24 Jun 2013 18:11:52 +0530 Message-Id: <20130624124152.27508.54660.sendpatchset@codeblue.in.ibm.com> In-Reply-To: <20130624124014.27508.8906.sendpatchset@codeblue.in.ibm.com> References: <20130624124014.27508.8906.sendpatchset@codeblue.in.ibm.com> Subject: [PATCH RFC V10 6/18] xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13062412-5564-0000-0000-0000087E1B19 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 --- 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 d471c76..870e49f 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -239,6 +239,8 @@ void xen_uninit_lock_cpu(int cpu) per_cpu(lock_kicker_irq, cpu) = -1; } +static bool xen_pvspin __initdata = true; + void __init xen_init_spinlocks(void) { /* @@ -248,10 +250,22 @@ 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;