Re: [PATCH v1 3/5] s390/uv: convert PG_arch_1 users to only work on small folios

Matthew Wilcox
2024-04-05T03:36:06Z

On Thu, Apr 04, 2024 at 06:36:40PM +0200, David Hildenbrand wrote:
> Now that make_folio_secure() may only set PG_arch_1 for small folios,
> let's convert relevant remaining UV code to only work on (small) folios
> and simply reject large folios early. This way, we'll never end up
> touching PG_arch_1 on tail pages of a large folio in UV code.
>
> The folio_get()/folio_put() for functions that are documented to already
> hold a folio reference look weird and it should probably be removed.
> Similarly, uv_destroy_owned_page() and uv_convert_owned_from_secure()
> should really consume a folio reference instead. But these are cleanups for
> another day.

Yes, and we should convert arch_make_page_accessible() to
arch_make_folio_accessible() ... one of the two callers already has the
folio (and page-writeback already calls arch_make_folio_accessible()