Re: [PATCH 2/2] rust: drm: fix non-const `read8` in unit test

[Danilo Krummrich]

On Thu Jul 16, 2026 at 4:25 PM CEST, Gary Guo wrote:
> From: Gary Guo <gary@xxxxxxxxxxx>
>
> With CONFIG_CC_OPTIMIZE_FOR_SIZE, the address validity check in non-const
> `read8` invocaction is not optimized away, leading to build failure.
>
> Signed-off-by: Gary Guo <gary@xxxxxxxxxxx>

Fixes: d055768429b3 ("rust: drm: gem: shmem: Add vmap functions")

> ---
>  rust/kernel/drm/gem/shmem.rs | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/rust/kernel/drm/gem/shmem.rs b/rust/kernel/drm/gem/shmem.rs
> index 580e0808d6c0..a687d46d170d 100644
> --- a/rust/kernel/drm/gem/shmem.rs
> +++ b/rust/kernel/drm/gem/shmem.rs
> @@ -688,7 +688,7 @@ fn vmap_io() -> Result {
>          // Ensure the ordering in memory is correct
>          let expected = 0xFEDCBA98_u32.to_ne_bytes().into_iter();
>          for (offset, expected) in (0x20..=0x23).zip(expected) {
> -            assert_eq!(vmap.read8(offset), expected);
> +            assert_eq!(vmap.try_read8(offset).unwrap(), expected);
>          }
>  
>          Ok(())
> -- 
> 2.54.0