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] x86-64: Use safe_apic_wait_icr_idle in __send_IPI_dest_field - x86_64
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=70ae77f497a57b3ef6b0987b6310327264517cb0;p=deliverable%2Flinux.git

[PATCH] x86-64: Use safe_apic_wait_icr_idle in __send_IPI_dest_field - x86_64

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/include/asm-x86_64/ipi.h b/include/asm-x86_64/ipi.h
index 26961e671948..a7c75ea408a8 100644
--- a/include/asm-x86_64/ipi.h
+++ b/include/asm-x86_64/ipi.h
@@ -85,7 +85,10 @@ static inline void __send_IPI_dest_field(unsigned int mask, int vector, unsigned
 	/*
 	 * 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