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The current safety comment on `io_read`/`io_write` does not cover the topic about alignment. Add it so it can be relied on by implementor of `IoCapable`. Expand the check performed by `Io` by taking `self.addr()` into consideration when checking if `offset` is aligned. For the compile-time `io_addr_assert` check, check using the known minimum alignment of `Io::Target` and the accessed type. While at it, fix the alignment check to use `align_of` instead of `size_of`. The values match for all primitives (including u64, given that we do not provide u64 accessor on 32-bit platforms), but are not necessarily true for custom types. Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com> Link: https://patch.msgid.link/20260706-io_projection-v6-2-72cd5d055d54@garyguo.net Signed-off-by: Danilo Krummrich <dakr@kernel.org>