The timer softirq on the RT kernel

[yunhong jiang]

Hi,Mike & Steven
	On https://lkml.org/lkml/2015/3/24/1178, the patch of "timers:
do not raise softirq unconditionally" is reverted. Thanks for Steven's
detailed comments, it's quite clear explained.
	I remember Mike has a patch trying to fix it but late
abandoned. Do you still have any plan to work on this? Otherwise, I
will have a try.
	
Thanks
--jyh