x86: remove vector_lock around cpu_online_map

This lock does not protect cpu_online_map, so its
length can be shortened, and in some cases, removed.

Signed-off-by: Glauber Costa <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 1a592400d94f6633f806e617c262a0b3b090d79f..ca3a3c5b64fea453ff8c7bb21925a9a4426922d6 100644 (file)
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -261,9 +261,9 @@ void __cpuinit start_secondary(void)
        /*
         * Allow the master to continue.
         */
+       spin_unlock(&vector_lock);
        cpu_set(smp_processor_id(), cpu_online_map);
        per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
-       spin_unlock(&vector_lock);
 
        unlock_ipi_call_lock();
 
@@ -879,10 +879,8 @@ int __cpu_disable(void)
        local_irq_disable();
        remove_siblinginfo(cpu);
 
-       spin_lock(&vector_lock);
        /* It's now safe to remove this processor from the online map */
        cpu_clear(cpu, cpu_online_map);
-       spin_unlock(&vector_lock);
        remove_cpu_from_maps();
        fixup_irqs(cpu_online_map);
        return 0;