linux-kernel - [tip: locking/core] locking/mutex: Simplify <linux/mutex.h>

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Date: Wed, 28 Feb 2024 12:53:22 -0000
From: "tip-bot2 for Waiman Long" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Waiman Long <longman@...hat.com>, Ingo Molnar <mingo@...nel.org>,
 Boqun Feng <boqun.feng@...il.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: locking/core] locking/mutex: Simplify <linux/mutex.h>

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     d6cac0b6b0115fd0a5f51a49401473626e4e4fe7
Gitweb:        https://git.kernel.org/tip/d6cac0b6b0115fd0a5f51a49401473626e4e4fe7
Author:        Waiman Long <longman@...hat.com>
AuthorDate:    Thu, 22 Feb 2024 10:05:38 -05:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 28 Feb 2024 13:08:37 +01:00

locking/mutex: Simplify <linux/mutex.h>

CONFIG_DEBUG_MUTEXES and CONFIG_PREEMPT_RT are mutually exclusive. They
can't be both set at the same time.  Move up the mutex_destroy() function
declaration and the __DEBUG_MUTEX_INITIALIZER() macro above the "#ifndef
CONFIG_PREEMPT_RT" section to eliminate duplicated mutex_destroy()
declaration.

Also remove the duplicated mutex_trylock() function declaration in the
CONFIG_PREEMPT_RT section.

Signed-off-by: Waiman Long <longman@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Boqun Feng <boqun.feng@...il.com>
Link: https://lore.kernel.org/r/20240222150540.79981-3-longman@redhat.com
---
 include/linux/mutex.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 7e208d4..67edc4c 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -32,11 +32,9 @@
 # define __DEP_MAP_MUTEX_INITIALIZER(lockname)
 #endif
 
-#ifndef CONFIG_PREEMPT_RT
-
 #ifdef CONFIG_DEBUG_MUTEXES
 
-#define __DEBUG_MUTEX_INITIALIZER(lockname)				\
+# define __DEBUG_MUTEX_INITIALIZER(lockname)				\
 	, .magic = &lockname
 
 extern void mutex_destroy(struct mutex *lock);
@@ -49,6 +47,7 @@ static inline void mutex_destroy(struct mutex *lock) {}
 
 #endif
 
+#ifndef CONFIG_PREEMPT_RT
 /**
  * mutex_init - initialize the mutex
  * @mutex: the mutex to be initialized
@@ -101,9 +100,6 @@ extern bool mutex_is_locked(struct mutex *lock);
 
 extern void __mutex_rt_init(struct mutex *lock, const char *name,
 			    struct lock_class_key *key);
-extern int mutex_trylock(struct mutex *lock);
-
-static inline void mutex_destroy(struct mutex *lock) { }
 
 #define mutex_is_locked(l)	rt_mutex_base_is_locked(&(l)->rtmutex)