linux-kernel - [PATCH V13 06/14] xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks

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Date:	Fri,  9 Aug 2013 19:51:54 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	<mingo@...hat.com>, <hpa@...or.com>, <x86@...nel.org>,
	<jeremy@...p.org>, <konrad.wilk@...cle.com>, <gleb@...hat.com>,
	<pbonzini@...hat.com>
Cc:	<gregkh@...e.de>, <peterz@...radead.org>, <tglx@...utronix.de>,
	<agraf@...e.de>, <riel@...hat.com>, <avi.kivity@...il.com>,
	<habanero@...ux.vnet.ibm.com>, <chegu_vinod@...com>,
	<ouyang@...pitt.edu>, <drjones@...hat.com>,
	<attilio.rao@...rix.com>, linux-doc@...r.kernel.org,
	<torvalds@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<kvm@...r.kernel.org>, <andi@...stfloor.org>,
	<xen-devel@...ts.xensource.com>,
	<virtualization@...ts.linux-foundation.org>,
	<stefano.stabellini@...citrix.com>, <mtosatti@...hat.com>,
	<srivatsa.vaddagiri@...il.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Subject: [PATCH V13 06/14] xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks

From: Jeremy Fitzhardinge <jeremy@...p.org>

Signed-off-by: Jeremy Fitzhardinge <jeremy@...p.org>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Acked-by: Ingo Molnar <mingo@...nel.org>
---
 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;
-- 
1.7.11.7

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