Re: [PATCH v2 2/5] mm: add PTE_MARKER_GUARD PTE marker

[Lorenzo Stoakes]

On Mon, Oct 21, 2024 at 04:33:19PM +0100, Lorenzo Stoakes wrote:
[snip]


> * For hardware poison markers it makes sense to drop them as you're
>   effectively saying 'I am done with this range that is now unbacked and
>   expect to get an empty page should I use it now'. UFFD WP I am not sure
>   about but presumably also fine.

[snip]

CORRECTION: (sorry multitasking atm now I have a non-melted CPU) UFFD WP is
            safe from MADV_FREE as it checks is_poisoned_swp_entry() which
            this patch updates to include guard pages, a change I will undo
            in v3. So disregard comment on UFFD WP here.