Re: [PATCH 14/24] alpha: add ARCH_SUPPORTS_PAGE_TABLE_CHECK support

[Magnus Lindholm]

Hi Matt,

On Tue, Sep 1, 2026 at 5:51 PM Matt Turner <mattst88@xxxxxxxxx> wrote:
>
> Add the page table check helpers needed for CONFIG_PAGE_TABLE_CHECK
> and select ARCH_SUPPORTS_PAGE_TABLE_CHECK in Kconfig.
>
> Alpha does not support huge pages, so pmd_user_accessible_page() and
> pud_user_accessible_page() always return false. pte_user_accessible_page()
> checks for present PTEs with user read access (_PAGE_URE).
>

This patch does not build with CONFIG_PAGE_TABLE_CHECK enabled on
v7.3-rc1.

Commit cf8771ca4cdb ("mm/page_table_check: Pass mm_struct to
pxx_user_accessible_page()") changed these helpers from:

        pte_user_accessible_page(pte, addr)

to:

        pte_user_accessible_page(mm, addr, pte)

The Alpha definitions added here still use the old two-argument API.
The same applies to pmd_user_accessible_page() and
pud_user_accessible_page().

Could you update the helpers to use the new three-argument signatures?

Regards,
Magnus