Re: [rfc patch v4.4-rt2] sched: fix up preempt lazy forward port

[Grygorii Strashko]

On 01/18/2016 10:18 PM, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2016-01-18 10:08:23 [+0100]:
>
> > --- a/arch/x86/entry/common.c
> > +++ b/arch/x86/entry/common.c
> > @@ -220,14 +220,14 @@ long syscall_trace_enter(struct pt_regs
> >
> > #define EXIT_TO_USERMODE_LOOP_FLAGS				\
> > 	(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE |	\
> > -	 _TIF_NEED_RESCHED | _TIF_USER_RETURN_NOTIFY)
> > +	 _TIF_NEED_RESCHED_MASK | _TIF_USER_RETURN_NOTIFY)
>
> If I read this right, the loop where this define is used
> _TIF_ALLWORK_MASK in v4.1 of which _TIF_NEED_RESCHED_MASK was part of.
> Adding this will reassmeble the old behaviour.
> â

Just a question (sorry if dumb). ARM has _TIF_WORK_MASK defined:
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
	_TIF_NOTIFY_RESUME | _TIF_UPROBE)

which is used to calculate loop exit condition in
 do_work_pending() (arch/arm/kernel/signal.c).

Should _TIF_WORK_MASK also contain _TIF_NEED_RESCHED_LAZY?

--
regards,
-grygorii