Re: [PATCH mm-unstable v18 06/14] mm/khugepaged: generalize collapse_huge_page for mTHP collapse

[David Hildenbrand (Arm)]

On 6/1/26 17:00, Nico Pache wrote:
> On Mon, Jun 1, 2026 at 5:14 AM David Hildenbrand (Arm) <david@xxxxxxxxxx> wrote:
>>
>> On 6/1/26 12:47, Lance Yang wrote:
>>>
>>>
>>>
>>> Ah, cool! __folio_mark_uptodate() already does the job :P
>>>
>>> So yeah, no extra smp_wmb() needed here!
>>
>> Yeah. BTW, I think we'd need a spin_lock_nested(), so @Nico, treat my code as a
>> draft.
> 
> Okay, I read the above and did some investigating.
> 
> I will try to implement and verify the changes you suggested :)
> 
> Or an even crazier idea... what if we ensure MIPS checks for PMD_none
> before walking a PTE table?

But how would they update the cache then correctly?

I'm too non-MIPS to know the answer :)

-- 
Cheers,

David