Re: [PATCH v4 2/2] mm/gup/writeback: add callbacks for inaccessible pages

[Dave Hansen]

On 4/28/20 4:39 PM, Claudio Imbrenda wrote:
>> From where I'm standing, we have a hook in the core VM that can't
>> possibly work with some existing kernel functionality and has
>> virtually no chance of getting used on a second architecture.
> it seems to work at least for us, so it does possibly work :)

I think all you're saying is that it's been very lightly tested. :)

> regarding second architectures: when we started sending these patches
> around, there has been interest from some other architectures, so
> just because nobody else needs them now, it doesn't mean nobody will
> use them ever.

I was really interested in using them... until I looked at them.
Conceptually, they do something really useful, but the _implementation_
falls short of its promises.

I can't imagine ever using these hooks on x86.