linux-toradex.git/rust/kernel/list, branch v6.19-rc2

rust: list: remove nonexistent generic parameter in link

2025-07-20T17:29:19+00:00

`ListLinks` does not take a `T` generic parameter, unlike
`ListLinksSelfPtr`.

Thus fix it, which makes it also consistent with the rest of the links
in the file.

Fixes: 40c53294596b ("rust: list: add macro for implementing ListItem")
Reviewed-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250719232500.822313-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda

rust: list: remove OFFSET constants

2025-07-19T21:18:18+00:00

Replace `ListLinksSelfPtr::LIST_LINKS_SELF_PTR_OFFSET` with `unsafe fn
raw_get_self_ptr` which returns a pointer to the field rather than
requiring the caller to do pointer arithmetic.

Implement `HasListLinks::raw_get_list_links` in `impl_has_list_links!`,
narrowing the interface of `HasListLinks` and replacing pointer
arithmetic with `container_of!`.

Modify `impl_list_item` to also invoke `impl_has_list_links!` or
`impl_has_list_links_self_ptr!`. This is necessary to allow
`impl_list_item` to see more of the tokens used by
`impl_has_list_links{,_self_ptr}!`.

A similar API change was discussed on the hrtimer series[1].

Link: https://lore.kernel.org/all/20250224-hrtimer-v3-v6-12-rc2-v9-1-5bd3bf0ce6cc@kernel.org/ [1]
Tested-by: Alice Ryhl 
Reviewed-by: Alice Ryhl 
Signed-off-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250709-list-no-offset-v4-6-a429e75840a9@gmail.com
[ Fixed broken intra-doc links. Used the renamed
  `Opaque::cast_into`. - Miguel ]
Signed-off-by: Miguel Ojeda

rust: list: add `impl_list_item!` examples

2025-07-19T21:18:18+00:00

There's a comprehensive example in `rust/kernel/list.rs` but it doesn't
exercise the `using ListLinksSelfPtr` variant nor the generic cases. Add
that here. Generalize `impl_has_list_links_self_ptr` to handle nested
fields in the same manner as `impl_has_list_links`.

Tested-by: Alice Ryhl 
Reviewed-by: Alice Ryhl 
Signed-off-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250709-list-no-offset-v4-5-a429e75840a9@gmail.com
[ Fixed Rust < 1.82 build by enabling the `offset_of_nested`
  feature. - Miguel ]
Signed-off-by: Miguel Ojeda

rust: list: use fully qualified path

2025-07-19T21:18:18+00:00

Use a fully qualified path rooted at `$crate` rather than relying on
imports in the invoking scope.

Tested-by: Alice Ryhl 
Reviewed-by: Alice Ryhl 
Signed-off-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250709-list-no-offset-v4-4-a429e75840a9@gmail.com
Signed-off-by: Miguel Ojeda

rust: list: use consistent self parameter name

2025-07-19T21:18:18+00:00

Refer to the self parameter of `impl_list_item!` by the same name used
in `impl_has_list_links{,_self_ptr}!`.

Reviewed-by: Christian Schrefl 
Tested-by: Alice Ryhl 
Reviewed-by: Alice Ryhl 
Signed-off-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250709-list-no-offset-v4-3-a429e75840a9@gmail.com
Signed-off-by: Miguel Ojeda

rust: list: use consistent type parameter style

2025-07-19T21:18:18+00:00

Refer to the type parameters of `impl_has_list_links{,_self_ptr}!` by
the same name used in `impl_list_item!`. Capture type parameters of
`impl_list_item!` as `tt` using `{}` to match the style of all other
macros that work with generics.

Reviewed-by: Christian Schrefl 
Tested-by: Alice Ryhl 
Reviewed-by: Alice Ryhl 
Signed-off-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250709-list-no-offset-v4-2-a429e75840a9@gmail.com
Signed-off-by: Miguel Ojeda

rust: list: simplify macro capture

2025-07-19T21:18:18+00:00

Avoid manually capturing generics; use `ty` to capture the whole type
instead.

Reviewed-by: Christian Schrefl 
Tested-by: Alice Ryhl 
Reviewed-by: Alice Ryhl 
Signed-off-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250709-list-no-offset-v4-1-a429e75840a9@gmail.com
Signed-off-by: Miguel Ojeda

rust: list: undo unintended replacement of method name

2025-07-19T21:18:16+00:00

When we renamed `Opaque::raw_get` to `cast_into`, there was one
replacement that was not supposed to be there.

It does not cause an issue so far because it is inside a macro rule (the
`ListLinksSelfPtr` one) that is unused so far. However, it will start
to be used soon.

Thus fix it now.

Fixes: 64fb810bce03 ("rust: types: rename Opaque::raw_get to cast_into")
Reviewed-by: Tamir Duberstein 
Link: https://lore.kernel.org/r/20250719183649.596051-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda

rust: types: rename Opaque::raw_get to cast_into

2025-07-15T20:26:11+00:00

In the previous patch we added Opaque::cast_from() that performs the
opposite operation to Opaque::raw_get(). For consistency with this
naming, rename raw_get() to cast_from().

There are a few other options such as calling cast_from() something
closer to raw_get() rather than renaming this method. However, I could
not find a great naming scheme that works with raw_get(). The previous
version of this patch used from_raw(), but functions of that name
typically have a different signature, so that's not a great option.

Suggested-by: Danilo Krummrich 
Signed-off-by: Alice Ryhl 
Acked-by: Benno Lossin 
Acked-by: Andreas Hindborg 
Acked-by: Boqun Feng 
Reviewed-by: Danilo Krummrich 
Acked-by: Danilo Krummrich 
Link: https://lore.kernel.org/r/20250624-opaque-from-raw-v2-2-e4da40bdc59c@google.com
[ Removed `HrTimer::raw_get` change. - Miguel ]
Signed-off-by: Miguel Ojeda

rust: enable `clippy::ptr_as_ptr` lint

2025-06-22T21:08:42+00:00

In Rust 1.51.0, Clippy introduced the `ptr_as_ptr` lint [1]:

> Though `as` casts between raw pointers are not terrible,
> `pointer::cast` is safer because it cannot accidentally change the
> pointer's mutability, nor cast the pointer to other types like `usize`.

There are a few classes of changes required:
- Modules generated by bindgen are marked
  `#[allow(clippy::ptr_as_ptr)]`.
- Inferred casts (` as _`) are replaced with `.cast()`.
- Ascribed casts (` as *... T`) are replaced with `.cast::()`.
- Multistep casts from references (` as *const _ as *const T`) are
  replaced with `core::ptr::from_ref(&x).cast()` with or without `::`
  according to the previous rules. The `core::ptr::from_ref` call is
  required because `(x as *const _).cast::()` results in inference
  failure.
- Native literal C strings are replaced with `c_str!().as_char_ptr()`.
- `*mut *mut T as _` is replaced with `let *mut *const T = (*mut *mut
  T)`.cast();` since pointer to pointer can be confusing.

Apply these changes and enable the lint -- no functional change
intended.

Link: https://rust-lang.github.io/rust-clippy/master/index.html#ptr_as_ptr [1]
Reviewed-by: Benno Lossin 
Reviewed-by: Boqun Feng 
Signed-off-by: Tamir Duberstein 
Acked-by: Viresh Kumar 
Acked-by: Greg Kroah-Hartman 
Acked-by: Tejun Heo 
Acked-by: Danilo Krummrich 
Link: https://lore.kernel.org/r/20250615-ptr-as-ptr-v12-1-f43b024581e8@gmail.com
[ Added `.cast()` for `opp`. - Miguel ]
Signed-off-by: Miguel Ojeda