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I am not sure what is the meaning of the macro ENQUEUE_HEAD in linux mean. I have an intuition that it means to enqueue a task after it has woke up but still want to be sure.
Note: For reference purposes in v3.5.4 it is defined in /include/linux/sched.h and referenced at many place but one such place I am having problem is function enqueue_task_rt in file ./kernel/sched/rt.c
sched: Add enqueue/dequeue flags
ENQUEUE_HEAD – the waking task should be placed on the head
of the priority queue (where appropriate).
http://lkml.indiana.edu/hypermail/linux/kernel/1004.0/00744.html