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SubjectRe: [Fwd: lost need_resched flag re-introduced?]

> > A while back I reported the lost need_resched flag bug ( it happens if
> > need_resched is set right before switch_to() is called). Later on a one-line
> > fix is added to __schedule_tail().
> >
> > current->need_resched |= prev->need_resched;
> >
> > I looked at the latest kernel and found this one is gone. Is the lost
> > need_resched problem taken care of in some other way? Or is it re-introduced?

It is removed not only because it was wrong (which you have found too),
but because it was useless even if copied correctly.

current->need_resched is not changed in interrupt context outside
runqueue lock except for scheduler timer, where copying results
in nothing but spurious reschedule.

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