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[PATCH v7 1/6] rust: add C wrappers for ww_mutex inline functions

Onur Özkan posted 6 patches 1 month, 2 weeks ago
[PATCH v7 1/6] rust: add C wrappers for ww_mutex inline functions
Posted by Onur Özkan 1 month, 2 weeks ago 
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@onurozkan.dev>
---
 MAINTAINERS             |  1 +
 rust/helpers/helpers.c  |  1 +
 rust/helpers/ww_mutex.c | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 rust/helpers/ww_mutex.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 545a4776795e..03dca09d189a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14527,6 +14527,7 @@ F:	kernel/locking/
 F:	lib/locking*.[ch]
 F:	rust/helpers/mutex.c
 F:	rust/helpers/spinlock.c
+F:	rust/helpers/ww_mutex.c
 F:	rust/kernel/sync/lock.rs
 F:	rust/kernel/sync/lock/
 F:	rust/kernel/sync/locked_by.rs
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 551da6c9b506..58cf14d74516 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -59,4 +59,5 @@
 #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);
+}
+
-- 
2.51.2
Re: [PATCH v7 1/6] rust: add C wrappers for ww_mutex inline functions
Posted by Daniel Almeida 2 weeks, 6 days ago 

> On 1 Nov 2025, at 13:10, Onur Özkan <work@onurozkan.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@onurozkan.dev>
> ---
> MAINTAINERS             |  1 +
> rust/helpers/helpers.c  |  1 +
> rust/helpers/ww_mutex.c | 39 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 41 insertions(+)
> create mode 100644 rust/helpers/ww_mutex.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 545a4776795e..03dca09d189a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14527,6 +14527,7 @@ F: kernel/locking/
> F: lib/locking*.[ch]
> F: rust/helpers/mutex.c
> F: rust/helpers/spinlock.c
> +F: rust/helpers/ww_mutex.c
> F: rust/kernel/sync/lock.rs
> F: rust/kernel/sync/lock/
> F: rust/kernel/sync/locked_by.rs
> diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
> index 551da6c9b506..58cf14d74516 100644
> --- a/rust/helpers/helpers.c
> +++ b/rust/helpers/helpers.c
> @@ -59,4 +59,5 @@
> #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);
> +}
> +
> -- 
> 2.51.2
> 
> 

Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Re: [PATCH v7 1/6] rust: add C wrappers for ww_mutex inline functions
Posted by Lyude Paul 3 weeks, 3 days ago 
Reviewed-by: Lyude Paul <lyude@redhat.com>

On Sat, 2025-11-01 at 19:10 +0300, Onur Özkan 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@onurozkan.dev>
> ---
>  MAINTAINERS             |  1 +
>  rust/helpers/helpers.c  |  1 +
>  rust/helpers/ww_mutex.c | 39 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 41 insertions(+)
>  create mode 100644 rust/helpers/ww_mutex.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 545a4776795e..03dca09d189a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14527,6 +14527,7 @@ F:	kernel/locking/
>  F:	lib/locking*.[ch]
>  F:	rust/helpers/mutex.c
>  F:	rust/helpers/spinlock.c
> +F:	rust/helpers/ww_mutex.c
>  F:	rust/kernel/sync/lock.rs
>  F:	rust/kernel/sync/lock/
>  F:	rust/kernel/sync/locked_by.rs
> diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
> index 551da6c9b506..58cf14d74516 100644
> --- a/rust/helpers/helpers.c
> +++ b/rust/helpers/helpers.c
> @@ -59,4 +59,5 @@
>  #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);
> +}
> +

-- 
Cheers,
 Lyude Paul (she/her)
 Senior Software Engineer at Red Hat

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