From: Fernando Luis [** ISO-8859-1 charset **] VázquezCao <fernando@oss.ntt.co.jp>
Date: Wed, 2 May 2007 17:27:18 +0000 (+0200)
Subject: [PATCH] i386: Use safe_apic_wait_icr_idle in safe_apic_wait_icr_idle - i386
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=f5efb41e793ce587836b89b7191083b9a6185ed5;p=deliverable%2Flinux.git

[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>
---

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