Re: [GIT PULL] x86/mm changes for v4.21

[Peter Zijlstra]

On Wed, Feb 06, 2019 at 04:33:54PM -0800, Dave Hansen wrote:

> I wonder if the patches that you bisected to just changed the flushing
> from being CR3-based (and not taking an address) to being INVPCID-based,
> and taking an address that is sensitive to canonicality.

That is indeed one of the things that patch series does; before this it
would always flush world for ARRAY interfaces.

I'll have a look at the code; I seem to remember there being test for
canonical addresses, maybe they're not in the right place.