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

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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>
This commit is contained in:
Jeremy Fitzhardinge 2013-08-09 19:51:54 +05:30 • committed by H. Peter Anvin
commit b8fa70b51a
1 changed files with 14 additions and 0 deletions
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14
arch/x86/xen/spinlock.c
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@ -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;