x86: calibrate delay with irqs enabled

We do it to make it close to x86_64. The later needs it,
otherwise the nmi watchdog can get into the scene and kill us
with a hammer.

Enabling irqs here used to trigger a bug in i386. This is because
time irq handling relies upon structures that are only initialized
after smp initcalls (More precisely, it will find
per_cpu(hrtimer_bases, cpu)->cb_pending list not initialized and crash)

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index dbfaeb30a69a..bd2f8863efa2 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -167,7 +167,9 @@ static void __cpuinit smp_callin(void)
         /*
          * Get our bogomips.
          */
+        local_irq_enable();
         calibrate_delay();
+        local_irq_disable();
         Dprintk("Stack at about %p\n",&cpuid);
 
         /*