Messages in this thread Patch in this message | | | Date | Fri, 30 Jul 2021 15:50:53 +0200 | From | Thomas Gleixner <> | Subject | [patch 46/63] locking/ww_mutex: Implement rt_mutex accessors |
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From: Peter Zijlstra <peterz@infradead.org>
Provide the type defines and the helper inlines for rtmutex based ww_mutexes.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
--- kernel/locking/ww_mutex.h | 80 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) --- --- a/kernel/locking/ww_mutex.h +++ b/kernel/locking/ww_mutex.h @@ -1,5 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef WW_RT + #define MUTEX mutex #define MUTEX_WAITER mutex_waiter @@ -83,6 +85,82 @@ static inline void lockdep_assert_wait_l lockdep_assert_held(&lock->wait_lock); } +#else /* WW_RT */ + +#define MUTEX rt_mutex +#define MUTEX_WAITER rt_mutex_waiter + +static inline struct rt_mutex_waiter * +__ww_waiter_first(struct rt_mutex *lock) +{ + struct rb_node *n = rb_first(&lock->rtmutex.waiters.rb_root); + if (!n) + return NULL; + return rb_entry(n, struct rt_mutex_waiter, tree_entry); +} + +static inline struct rt_mutex_waiter * +__ww_waiter_next(struct rt_mutex *lock, struct rt_mutex_waiter *w) +{ + struct rb_node *n = rb_next(&w->tree_entry); + if (!n) + return NULL; + return rb_entry(n, struct rt_mutex_waiter, tree_entry); +} + +static inline struct rt_mutex_waiter * +__ww_waiter_prev(struct rt_mutex *lock, struct rt_mutex_waiter *w) +{ + struct rb_node *n = rb_prev(&w->tree_entry); + if (!n) + return NULL; + return rb_entry(n, struct rt_mutex_waiter, tree_entry); +} + +static inline struct rt_mutex_waiter * +__ww_waiter_last(struct rt_mutex *lock) +{ + struct rb_node *n = rb_last(&lock->rtmutex.waiters.rb_root); + if (!n) + return NULL; + return rb_entry(n, struct rt_mutex_waiter, tree_entry); +} + +static inline void +__ww_waiter_add(struct rt_mutex *lock, struct rt_mutex_waiter *waiter, struct rt_mutex_waiter *pos) +{ + /* RT unconditionally adds the waiter first and then removes it on error */ +} + +static inline struct task_struct * +__ww_mutex_owner(struct rt_mutex *lock) +{ + return rt_mutex_owner(&lock->rtmutex); +} + +static inline bool +__ww_mutex_has_waiters(struct rt_mutex *lock) +{ + return rt_mutex_has_waiters(&lock->rtmutex); +} + +static inline void lock_wait_lock(struct rt_mutex *lock) +{ + raw_spin_lock(&lock->rtmutex.wait_lock); +} + +static inline void unlock_wait_lock(struct rt_mutex *lock) +{ + raw_spin_unlock(&lock->rtmutex.wait_lock); +} + +static inline void lockdep_assert_wait_lock_held(struct rt_mutex *lock) +{ + lockdep_assert_held(&lock->rtmutex.wait_lock); +} + +#endif /* WW_RT */ + /* * Wait-Die: * The newer transactions are killed when: @@ -169,7 +247,9 @@ static bool if (waiter->ww_ctx->acquired > 0 && __ww_ctx_stamp_after(waiter->ww_ctx, ww_ctx)) { +#ifndef WW_RT debug_mutex_wake_waiter(lock, waiter); +#endif wake_up_process(waiter->task); }
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