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 db4484f5bf9844f87931ad6c0e7adc8c339d0e4b..a78044885ed5ee6b042944e8c66345d2f9b45bd1 100644 (file)
--- 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