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| -rw-r--r-- | Documentation/timers/timers-howto.rst | 3 | ||||
| -rw-r--r-- | include/linux/delay.h | 11 |
2 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/timers/timers-howto.rst b/Documentation/timers/timers-howto.rst index 7e3167bec2b1..afb0a43b8cdf 100644 --- a/Documentation/timers/timers-howto.rst +++ b/Documentation/timers/timers-howto.rst @@ -110,3 +110,6 @@ NON-ATOMIC CONTEXT: short, the difference is whether the sleep can be ended early by a signal. In general, just use msleep unless you know you have a need for the interruptible variant. + + FLEXIBLE SLEEPING (any delay, uninterruptible) + * Use fsleep diff --git a/include/linux/delay.h b/include/linux/delay.h index 8e6828094c1e..5e016a4029d9 100644 --- a/include/linux/delay.h +++ b/include/linux/delay.h @@ -65,4 +65,15 @@ static inline void ssleep(unsigned int seconds) msleep(seconds * 1000); } +/* see Documentation/timers/timers-howto.rst for the thresholds */ +static inline void fsleep(unsigned long usecs) +{ + if (usecs <= 10) + udelay(usecs); + else if (usecs <= 20000) + usleep_range(usecs, 2 * usecs); + else + msleep(DIV_ROUND_UP(usecs, 1000)); +} + #endif /* defined(_LINUX_DELAY_H) */ |