From: Barry Song <Baohua.Song@csr.com>
Date: Wed, 24 Aug 2011 01:31:26 +0000 (-0700)
Subject: ARM: mach-ux500: add explicit cpu_relax() for busy wait loop
X-Git-Tag: next-20110826~88^2~1
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=791d481ee4a6591c084627daa798570865fe2029;p=karo-tx-linux.git

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 1da23bb87c16..76ee3557ae3d 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)