Re: [GIT PULL] x86/mm changes for v5.9

From: Joerg Roedel
Date: Thu Aug 06 2020 - 14:57:30 EST

On Thu, Aug 06, 2020 at 03:10:34PM +0200, Ingo Molnar wrote:
> * Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> > So apparently the "the page-table pages are all pre-allocated now" is
> > simply not true. Joerg?

It pre-allocates the whole vmalloc/ioremap PUD/P4D pages, but I actually
only tested it with 4-level paging, as I don't have access to 5-level
paging hardware.

I'll try to make sense of that oops.

> > Unless somebody can figure this out fairly quickly, I think it should
> > just be reverted.
> Agreed. Joerg?

Yeah, please just revert that commit for now until I have an idea what
went wrong.