hrtimer: Get rid of hrtimer softirq
authorThomas Gleixner <tglx@linutronix.de>
Tue, 14 Apr 2015 21:08:51 +0000 (21:08 +0000)
committerThomas Gleixner <tglx@linutronix.de>
Wed, 22 Apr 2015 15:06:50 +0000 (17:06 +0200)
commitc6eb3f70d4482806dc2d3e1e3c7736f497b1d418
tree5585d1389441c34889b25cc8fb190ae3de7c0c35
parent895bdfa793f6e912d1a58fc445b3dd4d686f7bd3
hrtimer: Get rid of hrtimer softirq

hrtimer softirq is a leftover from the initial implementation and
serves only the purpose to handle the enqueueing of already expired
timers in the high resolution timer mode. We discussed whether we
change the return value and force all start sites to handle that the
timer is already expired, but that would be a Herculean task and I'm
not sure whether its a good idea to enforce that handling on
everyone.

A simpler solution is to enforce a timer interrupt instead of raising
and scheduling a softirq. Just use the existing infrastructure to do
so and remove all the softirq leftovers.

The HRTIMER softirq enum is now unused, but kept around because trace
parsers rely on the existing numbering.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20150414203501.840834708@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
include/linux/hrtimer.h
include/linux/interrupt.h
kernel/time/hrtimer.c
kernel/time/tick-common.c
kernel/time/timer.c