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>
mariux64 · Jan 4, 2011 · 357089f · 357089f
1 parent c1955b5
commit 357089f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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);
 }