On Fri, Aug 23, 2019 at 09:12:34AM -0300, Jason Gunthorpe wrote:

> I still haven't heard a satisfactory answer why a whole new scheme is
> needed and a simple:
> 
>    if (IS_ENABLED(CONFIG_DEBUG_ATOMIC_SLEEP))
>         preempt_disable()
> 
> isn't sufficient to catch the problematic cases during debugging??
> IMHO the fact preempt is changed by the above when debugging is not
> material here. I think that information should be included in the
> commit message at least.

That has a much larger impact and actually changes behaviour, while the
relatively simple patch Daniel proposed only adds a warning but doesn't
affect behaviour.
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