Re: [PATCH hotfix 6.12 v2 4/8] mm: resolve faulty mmap_region() error path behaviour

On Mon, Oct 28, 2024 at 10:14:50PM +0000, Lorenzo Stoakes wrote:

It doesn't make sense to have shmem explicitly check this one arch-specific
case, it is arch-specific, so the arch should handle it. We know shmem is a
case in which we want to permit MTE, so simply check for this directly.

This also fixes the issue with checking arch_validate_flags() early, which
would otherwise break mmap_region().

The relevant tests all pass with this on today's pending-fixes.

Tested-by: Mark Brown <broonie@kernel.org>