[patch 35/50] locking/ww_mutex: Switch to _mutex_t

From: Thomas Gleixner
Date: Tue Jul 13 2021 - 12:14:37 EST


From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

PREEMPT_RT replaces 'struct mutex' with a rtmutex based variant so all
mutex operations are included into the priority inheritance scheme, but
wants to utilize the ww_mutex specific part of the regular mutex
implementation as is.

As the regular mutex and ww_mutex implementation are tightly coupled
(ww_mutex has a 'struct mutex' inside) and share a lot of code (ww_mutex is
mostly an extension) a simple replacement of 'struct mutex' does not work.

'struct mutex' has a typedef '_mutex_t' associated. Replace all 'struct
mutex' references in ww_mutex with '_mutex_t' which allows to have a RT
specific 'struct mutex' in the final step.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/ww_mutex.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/include/linux/ww_mutex.h b/include/linux/ww_mutex.h
index 455542a42123..4f56ec47c698 100644
--- a/include/linux/ww_mutex.h
+++ b/include/linux/ww_mutex.h
@@ -29,7 +29,7 @@ struct ww_class {
};

struct ww_mutex {
- struct mutex base;
+ _mutex_t base;
struct ww_acquire_ctx *ctx;
#ifdef CONFIG_DEBUG_MUTEXES
struct ww_class *ww_class;
@@ -330,7 +330,7 @@ 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 _mutex_t_trylock(&lock->base);
}

/***
@@ -343,7 +343,7 @@ static inline int __must_check ww_mutex_trylock(struct ww_mutex *lock)
*/
static inline void ww_mutex_destroy(struct ww_mutex *lock)
{
- mutex_destroy(&lock->base);
+ _mutex_t_destroy(&lock->base);
}

/**
@@ -354,7 +354,7 @@ 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 _mutex_t_is_locked(&lock->base);
}

#endif