From: Andreas Mohr <andi@rhlx01.fht-esslingen.de>
Date: Mon, 26 Jun 2006 11:59:29 +0000 (+0200)
Subject: [PATCH] x86_64: Add cpu_relax to apic_wait_icr_idle
X-Git-Tag: v2.6.18-rc1~612^2~13
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=899ced0dd9457b9c349663ca4cb4ec09167728a6;p=platform%2Fkernel%2Flinux-3.10.git

[PATCH] x86_64: Add cpu_relax to apic_wait_icr_idle

This one is adding a cpu_relax() that already existed in the i386 version.

Signed-off-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/asm-x86_64/apic.h b/include/asm-x86_64/apic.h
index 9d43ac8..9c96a0a 100644
--- a/include/asm-x86_64/apic.h
+++ b/include/asm-x86_64/apic.h
@@ -49,7 +49,8 @@ static __inline unsigned int apic_read(unsigned long reg)
 
 static __inline__ void apic_wait_icr_idle(void)
 {
-	while ( apic_read( APIC_ICR ) & APIC_ICR_BUSY );
+	while (apic_read( APIC_ICR ) & APIC_ICR_BUSY)
+		cpu_relax();
 }
 
 static inline void ack_APIC_irq(void)