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NAME

       __wake_up_sync - wake up threads blocked on a waitqueue.

SYNOPSIS

       void fastcall __wake_up_sync  (wait_queue_head_t * q,
                                        unsigned int mode, int nr_exclusive);

ARGUMENTS

       q      the waitqueue

       mode   which threads

       nr_exclusive
              how many wake-one or wake-many threads to wake up

DESCRIPTION

       The sync wakeup differs that the waker knows that it will schedule away
       soon,  so  while  the  target  thread  will be woken up, it will not be
       migrated to another CPU - ie. the two threads are  ’synchronized’  with
       each other. This can prevent needless bouncing between CPUs.

       On UP it can prevent extra preemption.