diff options
| -rw-r--r-- | arch/ia64/kernel/time.c | 29 | ||||
| -rw-r--r-- | include/asm-ia64/delay.h | 10 |
2 files changed, 30 insertions, 9 deletions
diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c index 5b7e736f3b49..028a2b95936c 100644 --- a/arch/ia64/kernel/time.c +++ b/arch/ia64/kernel/time.c @@ -249,3 +249,32 @@ time_init (void) */ set_normalized_timespec(&wall_to_monotonic, -xtime.tv_sec, -xtime.tv_nsec); } + +#define SMALLUSECS 100 + +void +udelay (unsigned long usecs) +{ + unsigned long start; + unsigned long cycles; + unsigned long smallusecs; + + /* + * Execute the non-preemptible delay loop (because the ITC might + * not be synchronized between CPUS) in relatively short time + * chunks, allowing preemption between the chunks. + */ + while (usecs > 0) { + smallusecs = (usecs > SMALLUSECS) ? SMALLUSECS : usecs; + preempt_disable(); + cycles = smallusecs*local_cpu_data->cyc_per_usec; + start = ia64_get_itc(); + + while (ia64_get_itc() - start < cycles) + cpu_relax(); + + preempt_enable(); + usecs -= smallusecs; + } +} +EXPORT_SYMBOL(udelay); diff --git a/include/asm-ia64/delay.h b/include/asm-ia64/delay.h index 57182d6f2b9a..bba702076391 100644 --- a/include/asm-ia64/delay.h +++ b/include/asm-ia64/delay.h @@ -84,14 +84,6 @@ __delay (unsigned long loops) ia64_delay_loop (loops - 1); } -static __inline__ void -udelay (unsigned long usecs) -{ - unsigned long start = ia64_get_itc(); - unsigned long cycles = usecs*local_cpu_data->cyc_per_usec; - - while (ia64_get_itc() - start < cycles) - cpu_relax(); -} +extern void udelay (unsigned long usecs); #endif /* _ASM_IA64_DELAY_H */ |