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wait_event_interruptible vs wait_for_completion_interruptible

Hi,

1) whats the difference between wait_event_interruptible and
wait_for_completion_interruptible ?

2) When is one used in favour of the other ?

3) Why "might_sleep" check is ONLY for "completion" kind of sleep
routines but not for "wait" kind of sleep routines ?

thanks,
tkrishna

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