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locking/spinlock: Provide RT specific spinlock_t

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RT replaces spinlocks with a simple wrapper around an rtmutex, which turns
spinlocks on RT into 'sleeping' spinlocks. The actual implementation of the
spinlock API differs from a regular rtmutex, as it does neither handle
timeouts nor signals and it is state preserving across the lock operation.

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/20210815211303.654230709@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-08-15 23:28:22 +02:00 committed by Ingo Molnar
parent e4e17af3b7
commit 051790eecc
1 changed files with 26 additions and 0 deletions
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26
include/linux/spinlock_types.h
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@ -11,6 +11,9 @@
#include <linux/spinlock_types_raw.h>
#ifndef CONFIG_PREEMPT_RT
/* Non PREEMPT_RT kernels map spinlock to raw_spinlock */
typedef struct spinlock {
union {
struct raw_spinlock rlock;
@ -39,6 +42,29 @@ typedef struct spinlock {
#define DEFINE_SPINLOCK(x) spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
#else /* !CONFIG_PREEMPT_RT */
/* PREEMPT_RT kernels map spinlock to rt_mutex */
#include <linux/rtmutex.h>
typedef struct spinlock {
struct rt_mutex_base lock;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
#endif
} spinlock_t;
#define __SPIN_LOCK_UNLOCKED(name) \
{ \
.lock = __RT_MUTEX_BASE_INITIALIZER(name.lock), \
SPIN_DEP_MAP_INIT(name) \
}
#define DEFINE_SPINLOCK(name) \
spinlock_t name = __SPIN_LOCK_UNLOCKED(name)
#endif /* CONFIG_PREEMPT_RT */
#include <linux/rwlock_types.h>
#endif /* __LINUX_SPINLOCK_TYPES_H */