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 2963ab5d91eec94f7b9748f53e98004ed4d19663..bba4041bb7ff2c8ea3cc4285c9ae56c8154682a7 100644 (file)
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -124,6 +124,7 @@ static void *get_call_destination(u8 type)
                .pv_irq_ops = pv_irq_ops,
                .pv_apic_ops = pv_apic_ops,
                .pv_mmu_ops = pv_mmu_ops,
+               .pv_lock_ops = pv_lock_ops,
        };
        return *((void **)&tmpl + type);
 }
@@ -267,6 +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,
@@ -450,6 +460,15 @@ struct pv_mmu_ops pv_mmu_ops = {
        .set_fixmap = native_set_fixmap,
 };
 
+struct pv_lock_ops pv_lock_ops = {
+       .spin_is_locked = __ticket_spin_is_locked,
+       .spin_is_contended = __ticket_spin_is_contended,
+
+       .spin_lock = __ticket_spin_lock,
+       .spin_trylock = __ticket_spin_trylock,
+       .spin_unlock = __ticket_spin_unlock,
+};
+
 EXPORT_SYMBOL_GPL(pv_time_ops);
 EXPORT_SYMBOL    (pv_cpu_ops);
 EXPORT_SYMBOL    (pv_mmu_ops);