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    Subjectx86: 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>

    ---
    arch/x86/lib/delay.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    Index: linux-2.6/arch/x86/lib/delay.c
    ===================================================================
    --- linux-2.6.orig/arch/x86/lib/delay.c 2010-12-16 11:45:12.000000000 -0600
    +++ linux-2.6/arch/x86/lib/delay.c 2010-12-16 11:45:37.000000000 -0600
    @@ -121,7 +121,7 @@ inline void __const_udelay(unsigned long
    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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