[PATCH 1/4] x86: set cpu masks before calling CPU_STARTING notifiers

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

When booting up a CPU set the various topology masks before
calling the CPU_STARTING notifier. This way the notifier
can actually use the masks.

This is needed for a perf change.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 arch/x86/kernel/smpboot.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 083e99d..9d2980e 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -281,6 +281,10 @@ static void __cpuinit smp_callin(void)
 	 */
 	smp_store_cpu_info(cpuid);
 
+	/* This must be done before setting cpu_online_mask */
+	set_cpu_sibling_map(raw_smp_processor_id());
+	wmb();
+
 	notify_cpu_starting(cpuid);
 
 	/*
@@ -322,10 +326,6 @@ notrace static void __cpuinit start_secondary(void *unused)
 		legacy_pic->unmask(0);
 	}
 
-	/* This must be done before setting cpu_online_mask */
-	set_cpu_sibling_map(raw_smp_processor_id());
-	wmb();
-
 	/*
 	 * We need to hold call_lock, so there is no inconsistency
 	 * between the time smp_call_function() determines number of
-- 
1.7.1

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