Re: [PATCH v2 0/7] Nesting support for lazy MMU mode

David Hildenbrand
2025-09-09T09:22:01Z

On 09.09.25 04:16, Andrew Morton wrote:
> On Mon, 8 Sep 2025 08:39:24 +0100 Kevin Brodsky <kevin.brodsky@arm.com> wrote:
>
>> The main change enabling nesting is patch 2, following the approach
>> suggested by Catalin Marinas [4]: have enter() return some state and
>> the matching leave() take that state.
>
> This is so totally the correct way. Thanks.

Staring at this, I wonder if we could alternatively handle it like
pagefault_disable()/pagefault_enable(), having something like
current->lazy_mmu_enabled.

We wouldn't have to worry about preemption in that case I guess (unless
the arch has special requirements).

Not sure if that was already discussed, just a thought.

--
Cheers

David / dhildenb