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Change `page_align()` to return `Option<usize>` to allow validation of the provided `addr` value. This ensures that any value that is within one `PAGE_SIZE` of `usize::MAX` will not panic, and instead returns `None` to indicate overflow. Signed-off-by: Brendan Shephard <bshephar@bne-home.net> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com> Link: https://patch.msgid.link/20251223055647.9761-1-bshephar@bne-home.net [ Use kernel vertical style for imports; use markdown in comments. - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>