Dirk Behme d065cc7605 rust: mutex: fix __mutex_init() usage in case of PREEMPT_RT ... In case CONFIG_PREEMPT_RT is enabled __mutex_init() becomes a macro instead of an extern function (simplified from include/linux/mutex.h): #ifndef CONFIG_PREEMPT_RT extern void __mutex_init(struct mutex *lock, const char *name, struct lock_class_key *key); #else #define __mutex_init(mutex, name, key) \ do { \ rt_mutex_base_init(&(mutex)->rtmutex); \ __mutex_rt_init((mutex), name, key); \ } while (0) #endif The macro isn't resolved by bindgen, then. What results in a build error: error[E0425]: cannot find function `__mutex_init` in crate `bindings` --> rust/kernel/sync/lock/mutex.rs:104:28 | 104 | unsafe { bindings::__mutex_init(ptr, name, key) } | ^^^^^^^^^^^^ help: a function with a similar name exists: `__mutex_rt_init` | ::: rust/bindings/bindings_generated.rs:23722:5 | 23722 | / pub fn __mutex_rt_init( 23723 | | lock: *mut mutex, 23724 | | name: *const core::ffi::c_char, 23725 | | key: *mut lock_class_key, 23726 | | ); | |_____- similarly named function `__mutex_rt_init` defined here Fix this by adding a helper. As explained by Gary Guo in [1] no #ifdef CONFIG_PREEMPT_RT is needed here as rust/bindings/lib.rs prefers externed function to helpers if an externed function exists. Reported-by: Conor Dooley <conor@kernel.org> Link: https://lore.kernel.org/rust-for-linux/20240913-shack-estate-b376a65921b1@spud/ Link: https://lore.kernel.org/rust-for-linux/20240915123626.1a170103.gary@garyguo.net/ [1] Fixes: 6d20d629c6 ("rust: lock: introduce `Mutex`") Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> Tested-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://lore.kernel.org/r/20240916073752.3123484-1-dirk.behme@de.bosch.com [ Reworded to include the proper example by Dirk. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>		2024-09-26 21:22:15 +02:00
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blk.c
bug.c
build_assert.c
build_bug.c
err.c
helpers.c	rust: rbtree: add red-black tree implementation backed by the C version	2024-08-31 17:35:08 +02:00
kunit.c
mutex.c	rust: mutex: fix __mutex_init() usage in case of PREEMPT_RT	2024-09-26 21:22:15 +02:00
page.c
rbtree.c	rust: rbtree: add red-black tree implementation backed by the C version	2024-08-31 17:35:08 +02:00
refcount.c
signal.c
slab.c
spinlock.c
task.c
uaccess.c
wait.c
workqueue.c