[PATCH] i386: Use safe_apic_wait_icr_idle in safe_apic_wait_icr_idle - i386

Use safe_apic_wait_icr_idle to check ICR idle bit if the vector is
NMI_VECTOR to avoid potential hangups in the event of crash when kdump
tries to stop the other CPUs.

Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 4 insertions, 1 deletions

diff --git a/arch/i386/kernel/smp.c b/arch/i386/kernel/smp.c
index d14ffe2109b8..f8667109db1c 100644
--- a/arch/i386/kernel/smp.c
+++ b/arch/i386/kernel/smp.c
@@ -175,7 +175,10 @@ static inline void __send_IPI_dest_field(unsigned long mask, int vector)
         /*
          * Wait for idle.
          */
-        apic_wait_icr_idle();
+        if (unlikely(vector == NMI_VECTOR))
+                safe_apic_wait_icr_idle();
+        else
+                apic_wait_icr_idle();
                 
         /*
          * prepare target chip field