linux-kernel - [PATCH 39/45] C++: Fix spinlock initialisation

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Message-ID: <152261544964.30503.6618621118546753722.stgit@warthog.procyon.org.uk>
Date:   Sun, 01 Apr 2018 21:44:09 +0100
From:   David Howells <dhowells@...hat.com>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 39/45] C++: Fix spinlock initialisation

Fix a couple of bits of spinlock initialisation:

 (1) owner_cpu is unsigned: set to UINT_MAX rather than -1.

 (2) Don't need to cast the result of __SPIN_LOCK_INITIALIZER().

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/linux/spinlock_types.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h
index 24b4e6f2c1a2..d1ab81ee85fd 100644
--- a/include/linux/spinlock_types.h
+++ b/include/linux/spinlock_types.h
@@ -41,7 +41,7 @@ typedef struct raw_spinlock {
 #ifdef CONFIG_DEBUG_SPINLOCK
 # define SPIN_DEBUG_INIT(lockname)		\
 	.magic = SPINLOCK_MAGIC,		\
-	.owner_cpu = -1,			\
+	.owner_cpu = UINT_MAX,			\
 	.owner = SPINLOCK_OWNER_INIT,
 #else
 # define SPIN_DEBUG_INIT(lockname)
@@ -76,7 +76,7 @@ typedef struct spinlock {
 	{ { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
 
 #define __SPIN_LOCK_UNLOCKED(lockname) \
-	(spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
+	__SPIN_LOCK_INITIALIZER(lockname)
 
 #define DEFINE_SPINLOCK(x)	spinlock_t x = __SPIN_LOCK_UNLOCKED(x)