Re: TLB flushes on fixmap changes

From: Matthew Wilcox
Date: Sun Aug 26 2018 - 18:16:14 EST

On Sun, Aug 26, 2018 at 03:03:59PM -0700, Kees Cook wrote:
> I thought the point was that the implementation I suggested was
> NMI-proof? (And in reading Documentation/preempt-locking.txt it sounds
> like disabling interrupts is redundant to preempt_disable()? But I
> don't understand how; it looks like the preempt stuff is advisory?)

Oter way round; disabling interrupts implicitly disables preemption