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Subject[PATCH 36/52] remove vector_lock around cpu_online_map
Date
This lock does not protect cpu_online_map, so its
length can be shortened, and in some cases, removed.

Signed-off-by: Glauber Costa <gcosta@redhat.com>
---
arch/x86/kernel/smpboot_64.c | 4 +---
1 files changed, 1 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index 1a59240..ca3a3c5 100644
--- 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;
--
1.5.0.6


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