Peter Zijlstra 8cb75e0c4e sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding ...

With various drivers wanting to inject idle time; we get people
calling idle routines outside of the idle loop proper.

Therefore we need to be extra careful about not missing
TIF_NEED_RESCHED -> PREEMPT_NEED_RESCHED propagations.

While looking at this, I also realized there's a small window in the
existing idle loop where we can miss TIF_NEED_RESCHED; when it hits
right after the tif_need_resched() test at the end of the loop but
right before the need_resched() test at the start of the loop.

So move preempt_fold_need_resched() out of the loop where we're
guaranteed to have TIF_NEED_RESCHED set.

Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

2014-01-13 17:38:55 +01:00

..

idle.c

sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding

2014-01-13 17:38:55 +01:00

Makefile

…