[PATCH v6 03/24] mm: Dont assume page-table invariance during faults

[Andi Kleen]

Laurent Dufour <ldufour at linux.vnet.ibm.com> writes:

> From: Peter Zijlstra <peterz at infradead.org>
>
> One of the side effects of speculating on faults (without holding
> mmap_sem) is that we can race with free_pgtables() and therefore we
> cannot assume the page-tables will stick around.
>
> Remove the reliance on the pte pointer.

This needs a lot more explanation. So why is this code not needed with
SPF only?

-Andi