Re: [PATCH] mm/Kconfig: additional help text for HMM_MIRROR option

From: Christoph Hellwig
Date: Fri Jul 19 2019 - 08:01:04 EST

On Fri, Jul 19, 2019 at 08:48:53AM -0300, Jason Gunthorpe wrote:
> It is like MMU_NOTIFIERS, if something needs it, then it will select
> it.
> Maybe it should just be a hidden kconfig anyhow as there is no reason
> to turn it on without also turning on a using driver.

We can't just select it due to the odd X86_64 || PPC64 dependency.

Which also answers Pavels question: you never really need it, as we
can only use it for optional functionality due to that.