Re: [PATCH 2/9] rust: mm: add `task_size` helper

[Daniel Almeida <daniel.almeida@collabora.com>]

> On 1 Sep 2026, at 13:09, Ke Sun via B4 Relay <devnull+sunke.kylinos.cn@kernel.org> wrote:
> 
> From: Alvin Sun <alvin.sun@linux.dev>
> 
> Expose the task's address space size. It is used by the Tyr driver
> for splitting a VM's GPU address space into user and kernel regions.
> 
> Signed-off-by: Alvin Sun <alvin.sun@linux.dev>
> ---
> rust/kernel/mm.rs | 7 +++++++
> 1 file changed, 7 insertions(+)
> 
> diff --git a/rust/kernel/mm.rs b/rust/kernel/mm.rs
> index 4764d7b68f2a7..d2dfbb7d43972 100644
> --- a/rust/kernel/mm.rs
> +++ b/rust/kernel/mm.rs
> @@ -149,6 +149,13 @@ pub fn mmget_not_zero(&self) -> Option<ARef<MmWithUser>> {
>             None
>         }
>     }
> +
> +    /// The size of the process virtual address space.
> +    #[inline]
> +    pub fn task_size(&self) -> usize {
> +        // SAFETY: `self.as_raw()` is a valid pointer to an `mm_struct` per the type invariants.
> +        unsafe { (*self.as_raw()).__bindgen_anon_1.task_size }
> +    }
> }
> 
> // These methods require `mm_users` to be non-zero.
> 
> -- 
> 2.43.0
> 
> 


Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>