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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>
This commit is contained in:
Christoph Lameter 2010-12-16 12:14:43 -06:00 committed by Tejun Heo
parent c1955b5f3a
commit 357089fca9
1 changed files with 1 additions and 1 deletions
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2
arch/x86/lib/delay.c
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@ -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);
}