linux-kernel - [PATCH v8 07/31] locking/spinlock: introduce `__spin_lock

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Message-Id: <20220802015052.10452-8-ojeda@kernel.org>
Date:   Tue,  2 Aug 2022 03:49:54 +0200
From:   Miguel Ojeda <ojeda@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>
Subject: [PATCH v8 07/31] locking/spinlock: introduce `__spin_lock_init`

From: Wedson Almeida Filho <wedsonaf@...gle.com>

A Rust helper (introduced in a later patch) needs to call
`spin_lock_init` with a passed key, rather than define
one in place.

In order to do that, this changes the `spin_lock_init` macro
to call a new `__spin_lock_init` function which takes the key
as an extra parameter.

Co-developed-by: Alex Gaynor <alex.gaynor@...il.com>
Signed-off-by: Alex Gaynor <alex.gaynor@...il.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@...gle.com>
Co-developed-by: Miguel Ojeda <ojeda@...nel.org>
Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 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 5c0c5174155d..ad1c91884ed8 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -326,12 +326,17 @@ static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
 
 #ifdef CONFIG_DEBUG_SPINLOCK
 
+static inline void __spin_lock_init(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(lock, #lock, &__key);			\
 } while (0)
 
 #else
-- 
2.37.1