From fb0225871eea232fbfd2c4b356f5be172122a0fe Mon Sep 17 00:00:00 2001
From: Barry Song <Baohua.Song@csr.com>
Date: Tue, 23 Aug 2011 18:31:26 -0700
Subject: ARM: mach-ux500: add explicit cpu_relax() for busy wait loop

using cpu_relax in busy loops is a well-known idiom in the kernel. It's more
for documentation purposes than technically needed here.

Cc: Jamie Iles <jamie@jamieiles.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/arch/arm/mach-ux500/cpu.c b/arch/arm/mach-ux500/cpu.c
index 1da23bb..76ee355 100644
--- a/arch/arm/mach-ux500/cpu.c
+++ b/arch/arm/mach-ux500/cpu.c
@@ -62,7 +62,7 @@ static inline void ux500_cache_wait(void __iomem *reg, unsigned long mask)
 {
 	/* wait for the operation to complete */
 	while (readl_relaxed(reg) & mask)
-		;
+		cpu_relax();
 }
 
 static inline void ux500_cache_sync(void)
-- 
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