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Commit 3310bbed authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen/spinlock: Don't setup xen spinlock IPI kicker if disabled. 



There is no need to setup this kicker IPI if we are never going
to use the paravirtualized ticketlock mechanism.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 26a79995

arch/x86/xen/spinlock.c

+10 −1
Original line number Diff line number Diff line
@@ -105,6 +105,7 @@ static DEFINE_PER_CPU(char *, irq_name); 
static DEFINE_PER_CPU(struct xen_lock_waiting, lock_waiting);

static cpumask_t waiting_cpus;



static bool xen_pvspin __initdata = true;

static void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want)

{

	int irq = __this_cpu_read(lock_kicker_irq);
@@ -223,6 +224,9 @@ void xen_init_lock_cpu(int cpu) 
	int irq;

	char *name;



	if (!xen_pvspin)

		return;



	WARN(per_cpu(lock_kicker_irq, cpu) >= 0, "spinlock on CPU%d exists on IRQ%d!\n",

	     cpu, per_cpu(lock_kicker_irq, cpu));
@@ -259,13 +263,15 @@ void xen_uninit_lock_cpu(int cpu) 
	if (xen_hvm_domain())

		return;



	if (!xen_pvspin)

		return;



	unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL);

	per_cpu(lock_kicker_irq, cpu) = -1;

	kfree(per_cpu(irq_name, cpu));

	per_cpu(irq_name, cpu) = NULL;

}



static bool xen_pvspin __initdata = true;



void __init xen_init_spinlocks(void)

{
@@ -305,6 +311,9 @@ static int __init xen_spinlock_debugfs(void) 
	if (d_xen == NULL)

		return -ENOMEM;



	if (!xen_pvspin)

		return 0;



	d_spin_debug = debugfs_create_dir("spinlocks", d_xen);



	debugfs_create_u8("zero_stats", 0644, d_spin_debug, &zero_stats);