Re: [RFC V3 PATCH] arm64: mm: swap: save and restore mte tags for large folios

[David Hildenbrand]

On 14.11.23 02:43, Barry Song wrote:
> This patch makes MTE tags saving and restoring support large folios,
> then we don't need to split them into base pages for swapping out
> on ARM64 SoCs with MTE.
>
> arch_prepare_to_swap() should take folio rather than page as parameter
> because we support THP swap-out as a whole.
>
> Meanwhile, arch_swap_restore() should use page parameter rather than
> folio as swap-in always works at the granularity of base pages right
> now.

... but then we always have order-0 folios and can pass a folio, or what 
am I missing?

> arch_thp_swp_supported() is dropped since ARM64 MTE was the only one
> who needed it.

Can we do that separately?

--
Cheers,

David / dhildenb