Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b8fa70b5 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by H. Peter Anvin
Browse files

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



Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@goop.org>
Link: http://lkml.kernel.org/r/1376058122-8248-7-git-send-email-raghavendra.kt@linux.vnet.ibm.com


Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarRaghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Acked-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 80bd58fe

arch/x86/xen/spinlock.c

+14 −0
Original line number Diff line number Diff line
@@ -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;