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Commit fc25da9e authored by Glauber Costa's avatar Glauber Costa Committed by Ingo Molnar
Browse files

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: default avatarGlauber Costa <gcosta@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 70708a18

arch/x86/kernel/smpboot_64.c

+1 −3
Original line number Original line Diff line number Diff line
@@ -261,9 +261,9 @@ void __cpuinit start_secondary(void) 
	/*

	/*

	 * Allow the master to continue.

	 * Allow the master to continue.

	 */

	 */

	spin_unlock(&vector_lock);

	cpu_set(smp_processor_id(), cpu_online_map);

	cpu_set(smp_processor_id(), cpu_online_map);

	per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;

	per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;

	spin_unlock(&vector_lock);





	unlock_ipi_call_lock();

	unlock_ipi_call_lock();
@@ -879,10 +879,8 @@ int __cpu_disable(void) 
	local_irq_disable();

	local_irq_disable();

	remove_siblinginfo(cpu);

	remove_siblinginfo(cpu);





	spin_lock(&vector_lock);

	/* It's now safe to remove this processor from the online map */

	/* It's now safe to remove this processor from the online map */

	cpu_clear(cpu, cpu_online_map);

	cpu_clear(cpu, cpu_online_map);

	spin_unlock(&vector_lock);

	remove_cpu_from_maps();

	remove_cpu_from_maps();

	fixup_irqs(cpu_online_map);

	fixup_irqs(cpu_online_map);

	return 0;

	return 0;