diff options
Diffstat (limited to 'arch/x86/lib/delay_64.c')
| -rw-r--r-- | arch/x86/lib/delay_64.c | 11 |
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) |