linux-kernel - Re: [PATCH v6 1/7] rust: add C wrappers for ww

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Message-Id: <142043A6-0F31-4684-A203-AFFC6F36F6AE@collabora.com>
Date: Wed, 3 Sep 2025 10:46:45 -0300
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Onur Özkan <work@...rozkan.dev>
Cc: rust-for-linux@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 lossin@...nel.org,
 lyude@...hat.com,
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 aliceryhl@...gle.com,
 tmgross@...ch.edu,
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 daniel@...lak.dev,
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Subject: Re: [PATCH v6 1/7] rust: add C wrappers for ww_mutex inline functions



> On 3 Sep 2025, at 10:13, Onur Özkan <work@...rozkan.dev> wrote:
> 
> Some of the kernel's `ww_mutex` functions are implemented as
> `static inline`, so they are inaccessible from Rust as bindgen
> can't generate code on them. This patch provides C function wrappers
> around these inline implementations, so bindgen can see them and generate
> the corresponding Rust code.
> 
> Signed-off-by: Onur Özkan <work@...rozkan.dev>
> ---
> rust/helpers/helpers.c  |  1 +
> rust/helpers/ww_mutex.c | 39 +++++++++++++++++++++++++++++++++++++++
> 2 files changed, 40 insertions(+)
> create mode 100644 rust/helpers/ww_mutex.c
> 
> diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
> index 7cf7fe95e41d..4c789c5537b1 100644
> --- a/rust/helpers/helpers.c
> +++ b/rust/helpers/helpers.c
> @@ -50,4 +50,5 @@
> #include "vmalloc.c"
> #include "wait.c"
> #include "workqueue.c"
> +#include "ww_mutex.c"
> #include "xarray.c"
> diff --git a/rust/helpers/ww_mutex.c b/rust/helpers/ww_mutex.c
> new file mode 100644
> index 000000000000..61a487653394
> --- /dev/null
> +++ b/rust/helpers/ww_mutex.c
> @@ -0,0 +1,39 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/ww_mutex.h>
> +
> +void rust_helper_ww_mutex_init(struct ww_mutex *lock, struct ww_class *ww_class)
> +{
> + ww_mutex_init(lock, ww_class);
> +}
> +
> +void rust_helper_ww_acquire_init(struct ww_acquire_ctx *ctx, struct ww_class *ww_class)
> +{
> + ww_acquire_init(ctx, ww_class);
> +}
> +
> +void rust_helper_ww_acquire_done(struct ww_acquire_ctx *ctx)
> +{
> + ww_acquire_done(ctx);
> +}
> +
> +void rust_helper_ww_acquire_fini(struct ww_acquire_ctx *ctx)
> +{
> + ww_acquire_fini(ctx);
> +}
> +
> +void rust_helper_ww_mutex_lock_slow(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
> +{
> + ww_mutex_lock_slow(lock, ctx);
> +}
> +
> +int rust_helper_ww_mutex_lock_slow_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
> +{
> + return ww_mutex_lock_slow_interruptible(lock, ctx);
> +}
> +
> +bool rust_helper_ww_mutex_is_locked(struct ww_mutex *lock)
> +{
> + return ww_mutex_is_locked(lock);
> +}
> +
> --
> 2.50.0
> 

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