x86: Set cpu masks before calling CPU_STARTING notifiers

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@linux.intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1290077254-12165-2-git-send-email-andi@firstfloor.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 4 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index f0a0624eea55..68f61ac632e1 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -281,6 +281,13 @@ static void __cpuinit smp_callin(void)
          */
         smp_store_cpu_info(cpuid);
 
+        /*
+         * This must be done before setting cpu_online_mask
+         * or calling notify_cpu_starting.
+         */
+        set_cpu_sibling_map(raw_smp_processor_id());
+        wmb();
+
         notify_cpu_starting(cpuid);
 
         /*
@@ -316,10 +323,6 @@ notrace static void __cpuinit start_secondary(void *unused)
          */
         check_tsc_sync_target();
 
-        /* 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