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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	Will Deacon <will@kernel.org>, Waiman Long <longman@redhat.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Davidlohr Bueso <dave@stgolabs.net>
Subject: [patch 46/63] locking/ww_mutex: Implement rt_mutex accessors
Date: Fri, 30 Jul 2021 15:50:53 +0200	[thread overview]
Message-ID: <20210730135207.759735349@linutronix.de> (raw)
In-Reply-To: <20210730135007.155909613@linutronix.de>

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);
 	}
 


  parent reply	other threads:[~2021-07-30 14:22 UTC|newest]

Thread overview: 92+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 13:50 [patch 00/63] locking, sched: The PREEMPT-RT locking infrastructure Thomas Gleixner
2021-07-30 13:50 ` [patch 01/63] sched: Split out the wakeup state check Thomas Gleixner
2021-07-30 13:50 ` [patch 02/63] sched: Introduce TASK_RTLOCK_WAIT Thomas Gleixner
2021-07-30 13:50 ` [patch 03/63] sched: Prepare for RT sleeping spin/rwlocks Thomas Gleixner
2021-08-01 15:30   ` Mike Galbraith
2021-08-03  9:48     ` Peter Zijlstra
2021-08-03 14:04       ` Thomas Gleixner
2021-08-03 14:51         ` Peter Zijlstra
2021-08-03 20:11           ` Thomas Gleixner
2021-07-30 13:50 ` [patch 04/63] sched: Rework the __schedule() preempt argument Thomas Gleixner
2021-07-30 13:50 ` [patch 05/63] sched: Provide schedule point for RT locks Thomas Gleixner
2021-07-30 13:50 ` [patch 06/63] sched/wake_q: Provide WAKE_Q_HEAD_INITIALIZER Thomas Gleixner
2021-07-30 13:50 ` [patch 07/63] media/atomisp: Use lockdep instead of *mutex_is_locked() Thomas Gleixner
2021-07-30 13:50 ` [patch 08/63] rtmutex: Remove rt_mutex_is_locked() Thomas Gleixner
2021-07-30 13:50 ` [patch 09/63] rtmutex: Convert macros to inlines Thomas Gleixner
2021-07-30 13:50 ` [patch 10/63] rtmutex: Switch to try_cmpxchg() Thomas Gleixner
2021-07-30 13:50 ` [patch 11/63] rtmutex: Split API and implementation Thomas Gleixner
2021-07-30 13:50 ` [patch 12/63] rtmutex: Split out the inner parts of struct rtmutex Thomas Gleixner
2021-07-30 13:50 ` [patch 13/63] locking/rtmutex: Provide rt_mutex_slowlock_locked() Thomas Gleixner
2021-07-30 13:50 ` [patch 14/63] rtmutex: Provide rt_mutex_base_is_locked() Thomas Gleixner
2021-07-30 13:50 ` [patch 15/63] locking: Add base code for RT rw_semaphore and rwlock Thomas Gleixner
2021-08-04 19:37   ` Waiman Long
2021-08-05  9:04     ` Thomas Gleixner
2021-08-05 14:59       ` Waiman Long
2021-07-30 13:50 ` [patch 16/63] locking/rwsem: Add rtmutex based R/W semaphore implementation Thomas Gleixner
2021-07-30 13:50 ` [patch 17/63] locking/rtmutex: Add wake_state to rt_mutex_waiter Thomas Gleixner
2021-07-30 13:50 ` [patch 18/63] locking/rtmutex: Provide rt_wake_q and helpers Thomas Gleixner
2021-07-30 13:50 ` [patch 19/63] locking/rtmutex: Use rt_mutex_wake_q_head Thomas Gleixner
2021-07-30 13:50 ` [patch 20/63] locking/rtmutex: Prepare RT rt_mutex_wake_q for RT locks Thomas Gleixner
2021-07-30 13:50 ` [patch 21/63] locking/rtmutex: Guard regular sleeping locks specific functions Thomas Gleixner
2021-07-30 13:50 ` [patch 22/63] locking/spinlock: Split the lock types header Thomas Gleixner
2021-08-04 21:17   ` Waiman Long
2021-08-05  8:54     ` Thomas Gleixner
2021-07-30 13:50 ` [patch 23/63] locking/rtmutex: Prevent future include recursion hell Thomas Gleixner
2021-07-30 13:50 ` [patch 24/63] locking/lockdep: Reduce includes in debug_locks.h Thomas Gleixner
2021-07-30 13:50 ` [patch 25/63] rbtree: Split out the rbtree type definitions Thomas Gleixner
2021-07-30 13:50 ` [patch 26/63] locking/rtmutex: Include only rbtree types Thomas Gleixner
2021-07-30 13:50 ` [patch 27/63] locking/spinlock: Provide RT specific spinlock type Thomas Gleixner
2021-07-30 13:50 ` [patch 28/63] locking/spinlock: Provide RT variant header Thomas Gleixner
2021-07-30 13:50 ` [patch 29/63] locking/rtmutex: Provide the spin/rwlock core lock function Thomas Gleixner
2021-07-30 13:50 ` [patch 30/63] locking/spinlock: Provide RT variant Thomas Gleixner
2021-08-04 23:34   ` Waiman Long
2021-08-05  8:54     ` Thomas Gleixner
2021-07-30 13:50 ` [patch 31/63] locking/rwlock: " Thomas Gleixner
2021-07-30 13:50 ` [patch 32/63] locking/mutex: Consolidate core headers Thomas Gleixner
2021-07-30 13:50 ` [patch 33/63] locking/mutex: Move waiter to core header Thomas Gleixner
2021-07-30 13:50 ` [patch 34/63] locking/ww_mutex: Move ww_mutex declarations into ww_mutex.h Thomas Gleixner
2021-07-30 13:50 ` [patch 35/63] locking/mutex: Make mutex::wait_lock raw Thomas Gleixner
2021-07-30 13:50 ` [patch 36/63] locking/ww_mutex: Simplify lockdep annotation Thomas Gleixner
2021-07-30 13:50 ` [patch 37/63] locking/ww_mutex: Gather mutex_waiter initialization Thomas Gleixner
2021-07-30 13:50 ` [patch 38/63] locking/ww_mutex: Split up ww_mutex_unlock() Thomas Gleixner
2021-07-30 13:50 ` [patch 39/63] locking/ww_mutex: Split W/W implementation logic Thomas Gleixner
2021-07-30 13:50 ` [patch 40/63] locking/ww_mutex: Remove __sched annotation Thomas Gleixner
2021-07-30 13:50 ` [patch 41/63] locking/ww_mutex: Abstract waiter iteration Thomas Gleixner
2021-07-30 13:50 ` [patch 42/63] locking/ww_mutex: Abstract waiter enqueueing Thomas Gleixner
2021-07-30 13:50 ` [patch 43/63] locking/ww_mutex: Abstract mutex accessors Thomas Gleixner
2021-07-30 13:50 ` [patch 44/63] locking/ww_mutex: Abstract mutex types Thomas Gleixner
2021-07-30 13:50 ` [patch 45/63] locking/ww_mutex: Abstract internal lock access Thomas Gleixner
2021-07-30 13:50 ` Thomas Gleixner [this message]
2021-07-30 13:50 ` [patch 47/63] locking/ww_mutex: Add RT priority to W/W order Thomas Gleixner
2021-07-30 13:50 ` [patch 48/63] locking/ww_mutex: Add rt_mutex based lock type and accessors Thomas Gleixner
2021-07-30 13:50 ` [patch 49/63] locking/rtmutex: Extend the rtmutex core to support ww_mutex Thomas Gleixner
2021-07-30 13:50 ` [patch 50/63] locking/ww_mutex: Implement rtmutex based ww_mutex API functions Thomas Gleixner
2021-07-31 13:26   ` Mike Galbraith
2021-08-01 21:18     ` Thomas Gleixner
2021-07-30 13:50 ` [patch 51/63] locking/rtmutex: Add mutex variant for RT Thomas Gleixner
2021-07-30 13:50 ` [patch 52/63] lib/test_lockup: Adapt to changed variables Thomas Gleixner
2021-07-30 13:51 ` [patch 53/63] futex: Validate waiter correctly in futex_proxy_trylock_atomic() Thomas Gleixner
2021-07-30 13:51 ` [patch 54/63] futex: Cleanup stale comments Thomas Gleixner
2021-07-30 13:51 ` [patch 55/63] futex: Correct the number of requeued waiters for PI Thomas Gleixner
2021-07-30 13:51 ` [patch 56/63] futex: Restructure futex_requeue() Thomas Gleixner
2021-07-30 13:51 ` [patch 57/63] futex: Clarify comment in futex_requeue() Thomas Gleixner
2021-07-30 13:51 ` [patch 58/63] futex: Prevent requeue_pi() lock nesting issue on RT Thomas Gleixner
2021-08-02 12:56   ` Peter Zijlstra
2021-08-02 13:10     ` Peter Zijlstra
2021-08-02 14:35       ` Thomas Gleixner
2021-08-02 14:34     ` Thomas Gleixner
2021-08-03 10:28     ` Peter Zijlstra
2021-08-03 21:10       ` Thomas Gleixner
2021-08-03 10:07   ` Peter Zijlstra
2021-08-03 21:10     ` Thomas Gleixner
2021-08-03 11:20   ` Peter Zijlstra
2021-08-03 21:22     ` Thomas Gleixner
2021-07-30 13:51 ` [patch 59/63] rtmutex: Prevent lockdep false positive with PI futexes Thomas Gleixner
2021-07-30 13:51 ` [patch 60/63] preempt: Adjust PREEMPT_LOCK_OFFSET for RT Thomas Gleixner
2021-07-30 13:51 ` [patch 61/63] locking/rtmutex: Implement equal priority lock stealing Thomas Gleixner
2021-07-30 13:51 ` [patch 62/63] locking/rtmutex: Add adaptive spinwait mechanism Thomas Gleixner
2021-08-04 12:30   ` Peter Zijlstra
2021-08-04 17:49     ` Thomas Gleixner
2021-07-30 13:51 ` [patch 63/63] locking/rtmutex: Use adaptive spinwait for all rtmutex based locks Thomas Gleixner
     [not found] ` <20210803063217.2325-1-hdanton@sina.com>
2021-08-03  9:10   ` [patch 30/63] locking/spinlock: Provide RT variant Thomas Gleixner
2021-08-03 12:37 ` [patch 00/63] locking, sched: The PREEMPT-RT locking infrastructure Daniel Bristot de Oliveira

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