[PATCH] x86-64: Enable interrupts during delay calibration on APs

We used to disable them to work around a bug, but that
is not needed anymore. Keeping them enabled avoids the NMI
watchdog triggering in some cases.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index 4efe36fe99aa..277ce5e91e04 100644
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -413,8 +413,13 @@ void __cpuinit smp_callin(void)
 
         /*
          * Get our bogomips.
+         *
+         * Need to enable IRQs because it can take longer and then
+         * the NMI watchdog might kill us.
          */
+        local_irq_enable();
         calibrate_delay();
+        local_irq_disable();
         Dprintk("Stack at about %p\n",&cpuid);
 
         disable_APIC_timer();