aleph/lkl_linux
1
0
Fork 0
mirror of https://github.com/lkl/linux.git synced 2025-12-19 16:13:19 +09:00
Code Issues Packages Projects Releases Wiki Activity

locking/rtmutex: Add mutex variant for RT

Browse Source 
Add the necessary defines, helpers and API functions for replacing struct mutex on
a PREEMPT_RT enabled kernel with an rtmutex based variant.

No functional change when CONFIG_PREEMPT_RT=n

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210815211305.081517417@linutronix.de
This commit is contained in:
Thomas Gleixner
2021-08-15 23:29:01 +02:00
committed by Ingo Molnar
parent f8635d509d
commit bb630f9f7a
4 changed files with 187 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
include/linux/mutex.h
View File

@@ -20,6 +20,18 @@
#include <linux/osq_lock.h>
#include <linux/debug_locks.h>
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
, .dep_map = { \
.name = #lockname, \
.wait_type_inner = LD_WAIT_SLEEP, \
}
#else
# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
#endif
#ifndef CONFIG_PREEMPT_RT
/*
* Simple, straightforward mutexes with strict semantics:
*
@@ -93,16 +105,6 @@ do { \
__mutex_init((mutex), #mutex, &__key); \
} while (0)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
, .dep_map = { \
.name = #lockname, \
.wait_type_inner = LD_WAIT_SLEEP, \
}
#else
# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
#endif
#define __MUTEX_INITIALIZER(lockname) \
{ .owner = ATOMIC_LONG_INIT(0) \
, .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(lockname.wait_lock) \
@@ -124,6 +126,50 @@ extern void __mutex_init(struct mutex *lock, const char *name,
*/
extern bool mutex_is_locked(struct mutex *lock);
#else /* !CONFIG_PREEMPT_RT */
/*
* Preempt-RT variant based on rtmutexes.
*/
#include <linux/rtmutex.h>
struct mutex {
struct rt_mutex_base rtmutex;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
#endif
};
#define __MUTEX_INITIALIZER(mutexname) \
{ \
.rtmutex = __RT_MUTEX_BASE_INITIALIZER(mutexname.rtmutex) \
__DEP_MAP_MUTEX_INITIALIZER(mutexname) \
}
#define DEFINE_MUTEX(mutexname) \
struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
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)
#define __mutex_init(mutex, name, key) \
do { \
rt_mutex_base_init(&(mutex)->rtmutex); \
__mutex_rt_init((mutex), name, key); \
} while (0)
#define mutex_init(mutex) \
do { \
static struct lock_class_key __key; \
\
__mutex_init((mutex), #mutex, &__key); \
} while (0)
#endif /* CONFIG_PREEMPT_RT */
/*
* See kernel/locking/mutex.c for detailed documentation of these APIs.
* Also see Documentation/locking/mutex-design.rst.