paravirt: introduce a "lock-byte" spinlock implementation

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / paravirt.c

diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index f33816868707dca960c084858e4ab727eb10f104..bba4041bb7ff2c8ea3cc4285c9ae56c8154682a7 100644 (file)
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -268,6 +268,15 @@ enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
        return __get_cpu_var(paravirt_lazy_mode);
 }
 
+void __init paravirt_use_bytelocks(void)
+{
+       pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
+       pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
+       pv_lock_ops.spin_lock = __byte_spin_lock;
+       pv_lock_ops.spin_trylock = __byte_spin_trylock;
+       pv_lock_ops.spin_unlock = __byte_spin_unlock;
+}
+
 struct pv_info pv_info = {
        .name = "bare hardware",
        .paravirt_enabled = 0,