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authorManfred Spraul <manfred@colorfullife.com>2008-09-07 11:29:58 +0200
committerIngo Molnar <mingo@elte.hu>2008-10-13 10:19:57 +0200
commit0cefa5b9b0a61b62442c5d0ca00a304c5896b6e9 (patch)
tree5577d8a3b5ad2ab80c096c3b25f15b97d3a15fc6
parent295286a89107c353b9677bc604361c537fd6a1c0 (diff)
arch/x86/kernel/smpboot.c: Clarify when irq processing begins.
Secondary cpus start with local interrupts disabled. start_secondary() first initializes the new cpu, then it enables the local interrupts. (although interrupts are enabled within smp_callin() as well). Right now, the local interrupts are enabled as a side effect of calling ipi_call_lock_irq(). The attached patch clarifies when local interrupts are enabled. Signed-off-by: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/kernel/smpboot.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 76b6f50978f..b700c9a1064 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -334,14 +334,17 @@ static void __cpuinit start_secondary(void *unused)
* does not change while we are assigning vectors to cpus. Holding
* this lock ensures we don't half assign or remove an irq from a cpu.
*/
- ipi_call_lock_irq();
+ ipi_call_lock();
lock_vector_lock();
__setup_vector_irq(smp_processor_id());
cpu_set(smp_processor_id(), cpu_online_map);
unlock_vector_lock();
- ipi_call_unlock_irq();
+ ipi_call_unlock();
per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
+ /* enable local interrupts */
+ local_irq_enable();
+
setup_secondary_clock();
wmb();