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SubjectRe: [tip: x86/shstk] mm: Don't allow write GUPs to shadow stack memory

* tip-bot2 for Rick Edgecombe <tip-bot2@linutronix.de> wrote:

> The following commit has been merged into the x86/shstk branch of tip:
>
> Commit-ID: 7c8f82db8acb9f0935703c0d96cda552bbf91ff2
> Gitweb: https://git.kernel.org/tip/7c8f82db8acb9f0935703c0d96cda552bbf91ff2
> Author: Rick Edgecombe <rick.p.edgecombe@intel.com>
> AuthorDate: Mon, 12 Jun 2023 17:10:48 -07:00
> Committer: Rick Edgecombe <rick.p.edgecombe@intel.com>
> CommitterDate: Tue, 11 Jul 2023 14:12:47 -07:00
>
> mm: Don't allow write GUPs to shadow stack memory

JFYI, this commit was the last user of writable_file_mapping_allowed(),
which breaks the x86-defconfig build:

mm/gup.c:1015:13: error: ‘writable_file_mapping_allowed’ defined but not used [-Werror=unused-function]

There's also a now orphan reference to writable_file_mapping_allowed() in
the comment of folio_fast_pin_allowed().

Thanks,

Ingo

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