[PATCH v2 04/13] locking/spinlock: introduce spin_lock_init_with_key

Wedson Almeida Filho
2023-04-05T17:52:08Z

From: Wedson Almeida Filho <walmeida@microsoft.com>

Rust cannot call C macros, so it has its own macro to create a new lock
class when a spin lock is initialised. This new function allows Rust
code to pass the lock class it generates to the C implementation.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
---
v1 -> v2: No changes

include/linux/spinlock.h | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index be48f1cb1878..cdc92d095133 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -327,12 +327,17 @@ static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)

#ifdef CONFIG_DEBUG_SPINLOCK

+static inline void spin_lock_init_with_key(spinlock_t *lock, const char *name,
+ struct lock_class_key *key)
+{
+ __raw_spin_lock_init(spinlock_check(lock), name, key, LD_WAIT_CONFIG);
+}
+
# define spin_lock_init(lock) \
do { \
static struct lock_class_key __key; \
\
- __raw_spin_lock_init(spinlock_check(lock), \
- #lock, &__key, LD_WAIT_CONFIG); \
+ spin_lock_init_with_key(lock, #lock, &__key); \
} while (0)

#else
--
2.34.1