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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2011-09-28 02:13:39 -0700 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy@goop.org> | 2011-11-25 10:46:49 -0800 |
| commit | 81719e0b17701a6f84b23b8481bc3e622991145c (patch) | |
| tree | 25a02ddd5c79d5db02e5eb531e76eefddc3802b2 | |
| parent | 41288cd5241851dce862d87979af5d7c16e928ba (diff) | |
| download | xen-81719e0b17701a6f84b23b8481bc3e622991145c.tar.gz | |
xen/pvticketlocks: add xen_nopvspin parameter to disable xen pv ticketlocks
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
| -rw-r--r-- | arch/x86/xen/spinlock.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index f6133c57356f83..1e21c991513fa1 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -195,12 +195,26 @@ void xen_uninit_lock_cpu(int cpu) unbind_from_irqhandler(per_cpu(lock_kicker_irq, cpu), NULL); } +static bool xen_pvspin __initdata = true; + void __init xen_init_spinlocks(void) { + 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; |