linux-kernel - [PATCH v8 08/31] locking/spinlock: introduce `_raw_spin_lock

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Message-Id: <20220802015052.10452-9-ojeda@kernel.org>
Date:   Tue,  2 Aug 2022 03:49:55 +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 08/31] locking/spinlock: introduce `_raw_spin_lock_init`

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

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

In order to do that, this changes the `raw_spin_lock_init` macro
to call a new `_raw_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 | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index ad1c91884ed8..27df5380c1e4 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -99,11 +99,17 @@
   extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
 				   struct lock_class_key *key, short inner);
 
+static inline void _raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
+				       struct lock_class_key *key)
+{
+	__raw_spin_lock_init(lock, name, key, LD_WAIT_SPIN);
+}
+
 # define raw_spin_lock_init(lock)					\
 do {									\
 	static struct lock_class_key __key;				\
 									\
-	__raw_spin_lock_init((lock), #lock, &__key, LD_WAIT_SPIN);	\
+	_raw_spin_lock_init((lock), #lock, &__key);			\
 } while (0)
 
 #else
-- 
2.37.1