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authorJeremy Fitzhardinge <jeremy@goop.org>2013-08-09 19:51:54 +0530
committerH. Peter Anvin <hpa@linux.intel.com>2013-08-09 07:53:37 -0700
commitb8fa70b51aa76737bdb6b493901ef7376977489c (patch)
treeae8815641c8c6fccf88266d43f703d333e70b2aa /arch/x86/xen/spinlock.c
parent80bd58fef495d000a02fc5b55ca76d423400e748 (diff)
xen, pvticketlocks: Add xen_nopvspin parameter to disable xen pv ticketlocks
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org> Link: http://lkml.kernel.org/r/1376058122-8248-7-git-send-email-raghavendra.kt@linux.vnet.ibm.com Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/xen/spinlock.c')
-rw-r--r--arch/x86/xen/spinlock.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index a458729be25..669a971c78f 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;