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

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

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-08-26 14:28:06 -04:00
parent 26a7999527
commit 3310bbedac
1 changed files with 10 additions and 1 deletions
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11
arch/x86/xen/spinlock.c
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@ -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);