[PATCH] [14/34] i386: Use safe_apic_wait_icr_idle in safe_apic_wait_icr_idle - i386

[Andi Kleen]

From: Fernando Luis [** ISO-8859-1 charset **] VázquezCao <fernando@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>

---

---
 arch/i386/kernel/smp.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux/arch/i386/kernel/smp.c
===================================================================
--- linux.orig/arch/i386/kernel/smp.c
+++ linux/arch/i386/kernel/smp.c
@@ -175,7 +175,10 @@ static inline void __send_IPI_dest_field
 	/*
 	 * 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
-
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