[RFC,V9,6/19] xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks

Commit Message

Raghavendra K T June 1, 2013, 7:23 p.m. UTC

xen/pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks

From: Jeremy Fitzhardinge <[e-mail]>

Signed-off-by: Jeremy Fitzhardinge <[e-mail]>
Reviewed-by: Konrad Rzeszutek Wilk <[e-mail]>
Signed-off-by: Raghavendra K T <[e-mail]>
---
 arch/x86/xen/spinlock.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)


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Patch

diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index 860e190..3de6805 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -238,6 +238,8 @@  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)
 {
 	/*
@@ -247,10 +249,22 @@  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;