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-rw-r--r--include/linux/ww_mutex.h50
1 files changed, 39 insertions, 11 deletions
diff --git a/include/linux/ww_mutex.h b/include/linux/ww_mutex.h
index b77f39f319ad..29db736af86d 100644
--- a/include/linux/ww_mutex.h
+++ b/include/linux/ww_mutex.h
@@ -18,6 +18,24 @@
#define __LINUX_WW_MUTEX_H
#include <linux/mutex.h>
+#include <linux/rtmutex.h>
+
+#if defined(CONFIG_DEBUG_MUTEXES) || \
+ (defined(CONFIG_PREEMPT_RT) && defined(CONFIG_DEBUG_RT_MUTEXES))
+#define DEBUG_WW_MUTEXES
+#endif
+
+#ifndef CONFIG_PREEMPT_RT
+#define WW_MUTEX_BASE mutex
+#define ww_mutex_base_init(l,n,k) __mutex_init(l,n,k)
+#define ww_mutex_base_trylock(l) mutex_trylock(l)
+#define ww_mutex_base_is_locked(b) mutex_is_locked((b))
+#else
+#define WW_MUTEX_BASE rt_mutex
+#define ww_mutex_base_init(l,n,k) __rt_mutex_init(l,n,k)
+#define ww_mutex_base_trylock(l) rt_mutex_trylock(l)
+#define ww_mutex_base_is_locked(b) rt_mutex_base_is_locked(&(b)->rtmutex)
+#endif
struct ww_class {
atomic_long_t stamp;
@@ -28,16 +46,24 @@ struct ww_class {
unsigned int is_wait_die;
};
+struct ww_mutex {
+ struct WW_MUTEX_BASE base;
+ struct ww_acquire_ctx *ctx;
+#ifdef DEBUG_WW_MUTEXES
+ struct ww_class *ww_class;
+#endif
+};
+
struct ww_acquire_ctx {
struct task_struct *task;
unsigned long stamp;
unsigned int acquired;
unsigned short wounded;
unsigned short is_wait_die;
-#ifdef CONFIG_DEBUG_MUTEXES
+#ifdef DEBUG_WW_MUTEXES
unsigned int done_acquire;
struct ww_class *ww_class;
- struct ww_mutex *contending_lock;
+ void *contending_lock;
#endif
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map dep_map;
@@ -74,9 +100,9 @@ struct ww_acquire_ctx {
static inline void ww_mutex_init(struct ww_mutex *lock,
struct ww_class *ww_class)
{
- __mutex_init(&lock->base, ww_class->mutex_name, &ww_class->mutex_key);
+ ww_mutex_base_init(&lock->base, ww_class->mutex_name, &ww_class->mutex_key);
lock->ctx = NULL;
-#ifdef CONFIG_DEBUG_MUTEXES
+#ifdef DEBUG_WW_MUTEXES
lock->ww_class = ww_class;
#endif
}
@@ -113,7 +139,7 @@ static inline void ww_acquire_init(struct ww_acquire_ctx *ctx,
ctx->acquired = 0;
ctx->wounded = false;
ctx->is_wait_die = ww_class->is_wait_die;
-#ifdef CONFIG_DEBUG_MUTEXES
+#ifdef DEBUG_WW_MUTEXES
ctx->ww_class = ww_class;
ctx->done_acquire = 0;
ctx->contending_lock = NULL;
@@ -143,7 +169,7 @@ static inline void ww_acquire_init(struct ww_acquire_ctx *ctx,
*/
static inline void ww_acquire_done(struct ww_acquire_ctx *ctx)
{
-#ifdef CONFIG_DEBUG_MUTEXES
+#ifdef DEBUG_WW_MUTEXES
lockdep_assert_held(ctx);
DEBUG_LOCKS_WARN_ON(ctx->done_acquire);
@@ -163,7 +189,7 @@ static inline void ww_acquire_fini(struct ww_acquire_ctx *ctx)
#ifdef CONFIG_DEBUG_LOCK_ALLOC
mutex_release(&ctx->dep_map, _THIS_IP_);
#endif
-#ifdef CONFIG_DEBUG_MUTEXES
+#ifdef DEBUG_WW_MUTEXES
DEBUG_LOCKS_WARN_ON(ctx->acquired);
if (!IS_ENABLED(CONFIG_PROVE_LOCKING))
/*
@@ -269,7 +295,7 @@ static inline void
ww_mutex_lock_slow(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
{
int ret;
-#ifdef CONFIG_DEBUG_MUTEXES
+#ifdef DEBUG_WW_MUTEXES
DEBUG_LOCKS_WARN_ON(!ctx->contending_lock);
#endif
ret = ww_mutex_lock(lock, ctx);
@@ -305,7 +331,7 @@ static inline int __must_check
ww_mutex_lock_slow_interruptible(struct ww_mutex *lock,
struct ww_acquire_ctx *ctx)
{
-#ifdef CONFIG_DEBUG_MUTEXES
+#ifdef DEBUG_WW_MUTEXES
DEBUG_LOCKS_WARN_ON(!ctx->contending_lock);
#endif
return ww_mutex_lock_interruptible(lock, ctx);
@@ -322,7 +348,7 @@ extern void ww_mutex_unlock(struct ww_mutex *lock);
*/
static inline int __must_check ww_mutex_trylock(struct ww_mutex *lock)
{
- return mutex_trylock(&lock->base);
+ return ww_mutex_base_trylock(&lock->base);
}
/***
@@ -335,7 +361,9 @@ static inline int __must_check ww_mutex_trylock(struct ww_mutex *lock)
*/
static inline void ww_mutex_destroy(struct ww_mutex *lock)
{
+#ifndef CONFIG_PREEMPT_RT
mutex_destroy(&lock->base);
+#endif
}
/**
@@ -346,7 +374,7 @@ static inline void ww_mutex_destroy(struct ww_mutex *lock)
*/
static inline bool ww_mutex_is_locked(struct ww_mutex *lock)
{
- return mutex_is_locked(&lock->base);
+ return ww_mutex_base_is_locked(&lock->base);
}
#endif