aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorJeremy Fitzhardinge <jeremy@goop.org>2013-08-09 10:21:54 -0400
committerH. Peter Anvin <hpa@linux.intel.com>2013-08-09 10:53:37 -0400
commitb8fa70b51aa76737bdb6b493901ef7376977489c (patch)
treeae8815641c8c6fccf88266d43f703d333e70b2aa
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>
-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 a458729be25f..669a971c78fd 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -244,6 +244,8 @@ void xen_uninit_lock_cpu(int cpu)
244 per_cpu(irq_name, cpu) = NULL; 244 per_cpu(irq_name, cpu) = NULL;
245} 245}
246 246
247static bool xen_pvspin __initdata = true;
248
247void __init xen_init_spinlocks(void) 249void __init xen_init_spinlocks(void)
248{ 250{
249 /* 251 /*
@@ -253,10 +255,22 @@ void __init xen_init_spinlocks(void)
253 if (xen_hvm_domain()) 255 if (xen_hvm_domain())
254 return; 256 return;
255 257
258 if (!xen_pvspin) {
259 printk(KERN_DEBUG "xen: PV spinlocks disabled\n");
260 return;
261 }
262
256 pv_lock_ops.lock_spinning = xen_lock_spinning; 263 pv_lock_ops.lock_spinning = xen_lock_spinning;
257 pv_lock_ops.unlock_kick = xen_unlock_kick; 264 pv_lock_ops.unlock_kick = xen_unlock_kick;
258} 265}
259 266
267static __init int xen_parse_nopvspin(char *arg)
268{
269 xen_pvspin = false;
270 return 0;
271}
272early_param("xen_nopvspin", xen_parse_nopvspin);
273
260#ifdef CONFIG_XEN_DEBUG_FS 274#ifdef CONFIG_XEN_DEBUG_FS
261 275
262static struct dentry *d_spin_debug; 276static struct dentry *d_spin_debug;