From: Barry Song <21cnbao@gmail.com>
Date: Fri, 9 Sep 2011 09:30:34 +0000 (+0100)
Subject: ARM: 7089/1: L2X0: add explicit cpu_relax() for busy wait loop
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=1caf30924f71ae16a26aa59b02a6401f467bf1c8;p=~shefty%2Frdma-dev.git

ARM: 7089/1: L2X0: 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.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index db4484f5bf9..a78044885ed 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -37,7 +37,7 @@ static inline void cache_wait_way(void __iomem *reg, unsigned long mask)
 {
 	/* wait for cache operation by line or way to complete */
 	while (readl_relaxed(reg) & mask)
-		;
+		cpu_relax();
 }
 
 #ifdef CONFIG_CACHE_PL310