Re: [PATCH RFC v2 05/27] mm: page_alloc: Add an arch hook to allow prep_new_page() to fail

David Hildenbrand
2023-11-24T19:36:30Z

On 19.11.23 17:56, Alexandru Elisei wrote:
> Introduce arch_prep_new_page(), which will be used by arm64 to reserve tag
> storage for an allocated page. Reserving tag storage can fail, for example,
> if the tag storage page has a short pin on it, so allow prep_new_page() ->
> arch_prep_new_page() to similarly fail.

But what are the side-effects of this? How does the calling code recover?

E.g., what if we need to populate a page into user space, but that
particular page we allocated fails to be prepared? So we inject a signal
into that poor process?

--
Cheers,

David / dhildenb