linux-kernel - [PATCH v3 04/13] locking/spinlock: introduce spin_lock_init_with

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Date:   Sat,  8 Apr 2023 04:53:31 -0300
From:   Wedson Almeida Filho <wedsonaf@...il.com>
To:     rust-for-linux@...r.kernel.org
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <walmeida@...rosoft.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>
Subject: [PATCH v3 04/13] locking/spinlock: introduce spin_lock_init_with_key

From: Wedson Almeida Filho <walmeida@...rosoft.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@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Will Deacon <will@...nel.org>
Cc: Waiman Long <longman@...hat.com>
Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>
---
v1 -> v2: No changes
v2 -> v3: 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