Re: s390 && user_enable_single_step() (Was: odd utrace testingresults on s390x)

[Roland McGrath]

> > then the test-case from 6580807da14c423f0d0a708108e6df6ebc8bc83d
> > fails. This probably means that copy_process()->user_disable_single_step()
> > is not enough to clear the "this task wants single-stepping" copied
> > from parent.
> 
> user_disable_single_step() does not remove the TIF_SINGLE_STEP bit from the
> forked task. Perhaps we should just clear the bit in the function.

If that were to fix this test case, I think it would be incidental rather
than meaning the right thing.  The "this task wants single-stepping" state
should not have anything to do with TIF_SINGLE_STEP.  It means "this task
recently had single-stepping", which is a separate moving part.

Thanks,
Roland
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