Man page 9 : mod_delayed_work_on

mod_delayed_work_on - modify delay of or queue a delayed work on specific CPU

bool mod_delayed_work_on(int  cpu , struct workqueue_struct *  wq , struct delayed_work *  dwork , unsigned long  delay );

cpu
    CPU number to execute work on

wq
    workqueue to use

dwork
    work to queue

delay
    number of jiffies to wait before queueing

If dwork is idle, equivalent to queue_delayed_work_on; otherwise, modify dworkAqs timer so that it expires after delay. If delay is zero, work is guaranteed to be scheduled immediately regardless of its current state.

Returns false if dwork was idle and queued, true if dwork was pending and its timer was modified.

This function is safe to call from any context including IRQ handler. See try_to_grab_pending for details.