tree 7065661f6559aff70244f2805ced48f894c9b38c
parent df0cc0539b4127bd02f64de2c335b4af1fdb3845
author Thomas Gleixner <tglx@linutronix.de> 1220195817 -0700
committer Arjan van de Ven <arjan@linux.intel.com> 1220675699 -0700

select: add poll_select_set_timeout() and poll_select_copy_remaining() helpers

This patch adds 2 helpers that will be used for the hrtimer based select/poll:

poll_select_set_timeout() is a helper that takes a timeout (as a second, nanosecond
pair) and turns that into a "struct timespec" that represents the absolute end time.
This is a common operation in the many select() and poll() variants and needs various,
common, sanity checks.

poll_select_copy_remaining() is a helper that takes care of copying the remaining
time to userspace, as select(), pselect() and ppoll() do. This function comes in
both a natural and a compat implementation (due to datastructure differences).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>