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Diffstat (limited to 'arch/x86/lib/delay_64.c')
-rw-r--r--arch/x86/lib/delay_64.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/x86/lib/delay_64.c b/arch/x86/lib/delay_64.c
index d0326d07c84..ff3dfecdb6f 100644
--- a/arch/x86/lib/delay_64.c
+++ b/arch/x86/lib/delay_64.c
@@ -103,9 +103,16 @@ EXPORT_SYMBOL(__delay);
inline void __const_udelay(unsigned long xloops)
{
- __delay(((xloops * HZ *
- cpu_data(raw_smp_processor_id()).loops_per_jiffy) >> 32) + 1);
+ int d0;
+ xloops *= 4;
+ __asm__("mull %%edx"
+ :"=d" (xloops), "=&a" (d0)
+ :"1" (xloops), "0"
+ (cpu_data(raw_smp_processor_id()).loops_per_jiffy * (HZ/4)));
+
+ __delay(++xloops);
}
+
EXPORT_SYMBOL(__const_udelay);
void __udelay(unsigned long usecs)