From 357089fca91f639dd005ae0721f5f932b4f276ab Mon Sep 17 00:00:00 2001
From: Christoph Lameter <cl@linux.com>
Date: Thu, 16 Dec 2010 12:14:43 -0600
Subject: [PATCH] x86: udelay: Use this_cpu_read to avoid address calculation
The code will use a segment prefix instead of doing the lookup and
calculation.
Signed-off-by: Christoph Lameter <cl@linux.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
---
arch/x86/lib/delay.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/lib/delay.c b/arch/x86/lib/delay.c
index ff485d361182..fc45ba887d05 100644
--- a/arch/x86/lib/delay.c
+++ b/arch/x86/lib/delay.c
@@ -121,7 +121,7 @@ inline void __const_udelay(unsigned long xloops)
asm("mull %%edx"
:"=d" (xloops), "=&a" (d0)
:"1" (xloops), "0"
- (cpu_data(raw_smp_processor_id()).loops_per_jiffy * (HZ/4)));
+ (this_cpu_read(cpu_info.loops_per_jiffy) * (HZ/4)));
__delay(++xloops);
}
--
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