[RFC PATCH v2 1/3] mm/huge_memory: make persistent huge zero folio read-only

[David Hildenbrand (Arm)]

On 6/11/26 13:58, Lance Yang wrote:
> 
> On Thu, Jun 11, 2026 at 01:28:58PM +0200, David Hildenbrand (Arm) wrote:
>> On 6/10/26 04:15, Lance Yang wrote:
>>>
>>>
>>> Right, this came from the RFC v1 discussion[1]. David preferred a page-
>>> range helper for possible future non-folio callers, not something folio-
>>> only.
>>>
>>> Of course, we could also add a folio wrapper on top of that if needed :)
>>
>> Best to document that as part of the patch description: we don't really expect
>> to have a lot of read-only folios in the near future (zero page is rather
>> special; maybe it won't even be a folio in the future).
> 
> Ah, good to know, thanks. Will spell that out in RFC v3.
> 
> Maybe something like this?
> 
> The huge zero page is pretty special case, and maybe it won't even be a
> folio in the future. Since read-only folios are unlikely to become a
> common thing, a page-range helper is the cleaner fit.

Right. And if read-only folios in FSes become a real thing, we can always add
infrastructure for that.

-- 
Cheers,

David