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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>,
	Mike Galbraith <efault@gmx.de>
Subject: [patch V5 45/72] locking/ww_mutex: Abstract waiter iteration
Date: Sun, 15 Aug 2021 23:28:45 +0200 (CEST)	[thread overview]
Message-ID: <20210815211304.509186185@linutronix.de> (raw)
In-Reply-To: <20210815203225.710392609@linutronix.de>

From: Peter Zijlstra <peterz@infradead.org>

Split out the waiter iteration functions so they can be substituted for a
rtmutex based ww_mutex later.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/locking/ww_mutex.h |   57 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 4 deletions(-)
---
--- a/kernel/locking/ww_mutex.h
+++ b/kernel/locking/ww_mutex.h
@@ -1,5 +1,49 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+static inline struct mutex_waiter *
+__ww_waiter_first(struct mutex *lock)
+{
+	struct mutex_waiter *w;
+
+	w = list_first_entry(&lock->wait_list, struct mutex_waiter, list);
+	if (list_entry_is_head(w, &lock->wait_list, list))
+		return NULL;
+
+	return w;
+}
+
+static inline struct mutex_waiter *
+__ww_waiter_next(struct mutex *lock, struct mutex_waiter *w)
+{
+	w = list_next_entry(w, list);
+	if (list_entry_is_head(w, &lock->wait_list, list))
+		return NULL;
+
+	return w;
+}
+
+static inline struct mutex_waiter *
+__ww_waiter_prev(struct mutex *lock, struct mutex_waiter *w)
+{
+	w = list_prev_entry(w, list);
+	if (list_entry_is_head(w, &lock->wait_list, list))
+		return NULL;
+
+	return w;
+}
+
+static inline struct mutex_waiter *
+__ww_waiter_last(struct mutex *lock)
+{
+	struct mutex_waiter *w;
+
+	w = list_last_entry(&lock->wait_list, struct mutex_waiter, list);
+	if (list_entry_is_head(w, &lock->wait_list, list))
+		return NULL;
+
+	return w;
+}
+
 /*
  * Wait-Die:
  *   The newer transactions are killed when:
@@ -161,7 +205,9 @@ static void
 
 	lockdep_assert_held(&lock->wait_lock);
 
-	list_for_each_entry(cur, &lock->wait_list, list) {
+	for (cur = __ww_waiter_first(lock); cur;
+	     cur = __ww_waiter_next(lock, cur)) {
+
 		if (!cur->ww_ctx)
 			continue;
 
@@ -263,8 +309,9 @@ static inline int
 	 * If there is a waiter in front of us that has a context, then its
 	 * stamp is earlier than ours and we must kill ourself.
 	 */
-	cur = waiter;
-	list_for_each_entry_continue_reverse(cur, &lock->wait_list, list) {
+	for (cur = __ww_waiter_prev(lock, waiter); cur;
+	     cur = __ww_waiter_prev(lock, cur)) {
+
 		if (!cur->ww_ctx)
 			continue;
 
@@ -309,7 +356,9 @@ static inline int
 	 * may wound the lock holder.
 	 */
 	pos = &lock->wait_list;
-	list_for_each_entry_reverse(cur, &lock->wait_list, list) {
+	for (cur = __ww_waiter_last(lock); cur;
+	     cur = __ww_waiter_prev(lock, cur)) {
+
 		if (!cur->ww_ctx)
 			continue;
 


  parent reply	other threads:[~2021-08-15 21:31 UTC|newest]

Thread overview: 160+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-15 21:27 [patch V5 00/72] locking, sched: The PREEMPT-RT locking infrastructure Thomas Gleixner
2021-08-15 21:27 ` [patch V5 01/72] locking/local_lock: Add missing owner initialization Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 02/72] locking/rtmutex: Set proper wait context for lockdep Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 03/72] sched: Split out the wakeup state check Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] sched/wakeup: Split out the wakeup ->__state check tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 04/72] sched: Introduce TASK_RTLOCK_WAIT Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] sched/wakeup: Introduce the TASK_RTLOCK_WAIT state bit tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 05/72] sched: Reorganize current::__state helpers Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] sched/wakeup: Reorganize the " tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 06/72] sched: Prepare for RT sleeping spin/rwlocks Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] sched/wakeup: " tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 07/72] sched: Rework the __schedule() preempt argument Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] sched/core: " tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 08/72] sched: Provide schedule point for RT locks Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] sched/core: Provide a scheduling " tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 09/72] sched/wake_q: Provide WAKE_Q_HEAD_INITIALIZER Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] sched/wake_q: Provide WAKE_Q_HEAD_INITIALIZER() tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 10/72] media/atomisp: Use lockdep instead of *mutex_is_locked() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-15 21:27 ` [patch V5 11/72] rtmutex: Remove rt_mutex_is_locked() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: " tip-bot2 for Peter Zijlstra
2021-08-15 21:27 ` [patch V5 12/72] rtmutex: Convert macros to inlines Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: " tip-bot2 for Sebastian Andrzej Siewior
2021-08-15 21:27 ` [patch V5 13/72] rtmutex: Switch to try_cmpxchg() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: Switch to from cmpxchg_*() to try_cmpxchg_*() tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 14/72] rtmutex: Split API and implementation Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: Split API from implementation tip-bot2 for Thomas Gleixner
2021-08-15 21:27 ` [patch V5 15/72] rtmutex: Split out the inner parts of struct rtmutex Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: Split out the inner parts of 'struct rtmutex' tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 16/72] locking/rtmutex: Provide rt_mutex_slowlock_locked() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 17/72] rtmutex: Provide rt_mutex_base_is_locked() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 18/72] locking: Add base code for RT rw_semaphore and rwlock Thomas Gleixner
2021-08-16  5:00   ` Davidlohr Bueso
2021-08-17 20:14   ` [tip: locking/core] locking/rt: " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 19/72] locking/rwsem: Add rtmutex based R/W semaphore implementation Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 20/72] locking/rtmutex: Add wake_state to rt_mutex_waiter Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 21/72] locking/rtmutex: Provide rt_wake_q and helpers Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: Provide rt_wake_q_head " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 22/72] locking/rtmutex: Use rt_mutex_wake_q_head Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 23/72] locking/rtmutex: Prepare RT rt_mutex_wake_q for RT locks Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 24/72] locking/rtmutex: Guard regular sleeping locks specific functions Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 25/72] locking/spinlock: Split the lock types header Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/spinlock: Split the lock types header, and move the raw types into <linux/spinlock_types_raw.h> tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 26/72] locking/rtmutex: Prevent future include recursion hell Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Sebastian Andrzej Siewior
2021-08-15 21:28 ` [patch V5 27/72] locking/lockdep: Reduce includes in debug_locks.h Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/lockdep: Reduce header dependencies in <linux/debug_locks.h> tip-bot2 for Sebastian Andrzej Siewior
2021-08-15 21:28 ` [patch V5 28/72] rbtree: Split out the rbtree type definitions Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] rbtree: Split out the rbtree type definitions into <linux/rbtree_types.h> tip-bot2 for Sebastian Andrzej Siewior
2021-08-15 21:28 ` [patch V5 29/72] locking/rtmutex: Include only rbtree types Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/rtmutex: Reduce <linux/rtmutex.h> header dependencies, only include <linux/rbtree_types.h> tip-bot2 for Sebastian Andrzej Siewior
2021-08-15 21:28 ` [patch V5 30/72] locking/spinlock: Provide RT specific spinlock type Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/spinlock: Provide RT specific spinlock_t tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 31/72] locking/spinlock: Provide RT variant header Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/spinlock: Provide RT variant header: <linux/spinlock_rt.h> tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 32/72] locking/rtmutex: Provide the spin/rwlock core lock function Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-27 17:21   ` [patch V5 32/72] " Boqun Feng
2021-08-27 20:03     ` Thomas Gleixner
2021-08-15 21:28 ` [patch V5 33/72] locking/spinlock: Provide RT variant Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 34/72] locking/rwlock: " Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-09-11  2:59   ` [patch V5 34/72] " Xiaoming Ni
2021-09-13  6:28     ` Sebastian Andrzej Siewior
2021-08-15 21:28 ` [patch V5 35/72] locking/rtmutex: Squash !RT tasks to DEFAULT_PRIO Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 36/72] locking/mutex: Consolidate core headers Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/mutex: Consolidate core headers, remove kernel/locking/mutex-debug.h tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 37/72] locking/mutex: Move waiter to core header Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/mutex: Move the 'struct mutex_waiter' definition from <linux/mutex.h> to the internal header tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 38/72] locking/ww_mutex: Move ww_mutex declarations into ww_mutex.h Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Move the ww_mutex definitions from <linux/mutex.h> into <linux/ww_mutex.h> tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 39/72] locking/mutex: Make mutex::wait_lock raw Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 40/72] locking/ww_mutex: Simplify lockdep annotation Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Simplify lockdep annotations tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 41/72] locking/ww_mutex: Gather mutex_waiter initialization Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-19 16:54   ` [patch V5 41/72] " Guenter Roeck
2021-08-19 18:08     ` [PATCH] locking/ww_mutex: Initialize waiter.ww_ctx properly Sebastian Andrzej Siewior
2021-08-19 18:22       ` Peter Zijlstra
2021-08-19 18:32         ` Sebastian Andrzej Siewior
2021-08-19 17:51   ` [patch V5 41/72] locking/ww_mutex: Gather mutex_waiter initialization Sebastian Andrzej Siewior
2021-08-19 18:17     ` Peter Zijlstra
2021-08-19 18:28       ` Sebastian Andrzej Siewior
2021-08-19 19:30       ` [PATCH v2] locking/ww_mutex: Initialize waiter.ww_ctx properly Sebastian Andrzej Siewior
2021-08-20 10:20         ` [tip: locking/core] " tip-bot2 for Sebastian Andrzej Siewior
2021-08-15 21:28 ` [patch V5 42/72] locking/ww_mutex: Split up ww_mutex_unlock() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra (Intel)
2021-08-15 21:28 ` [patch V5 43/72] locking/ww_mutex: Split W/W implementation logic Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Split out the W/W implementation logic into kernel/locking/ww_mutex.h tip-bot2 for Peter Zijlstra (Intel)
2021-08-15 21:28 ` [patch V5 44/72] locking/ww_mutex: Remove __sched annotation Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Remove the __sched annotation from ww_mutex APIs tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` Thomas Gleixner [this message]
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Abstract out the waiter iteration tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 46/72] locking/ww_mutex: Abstract waiter enqueueing Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Abstract out " tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 47/72] locking/ww_mutex: Abstract mutex accessors Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Abstract out " tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 48/72] locking/ww_mutex: Abstract mutex types Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Abstract out " tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 49/72] locking/ww_mutex: Abstract internal lock access Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] locking/ww_mutex: Abstract out internal lock accesses tip-bot2 for Thomas Gleixner
2021-08-15 21:28 ` [patch V5 50/72] locking/ww_mutex: Implement rt_mutex accessors Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 51/72] locking/ww_mutex: Add RT priority to W/W order Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 52/72] locking/ww_mutex: Add rt_mutex based lock type and accessors Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-15 21:28 ` [patch V5 53/72] locking/rtmutex: Extend the rtmutex core to support ww_mutex Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-15 21:29 ` [patch V5 54/72] locking/ww_mutex: Implement rtmutex based ww_mutex API functions Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Peter Zijlstra
2021-08-15 21:29 ` [patch V5 55/72] locking/rtmutex: Add mutex variant for RT Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 56/72] lib/test_lockup: Adapt to changed variables Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Sebastian Andrzej Siewior
2021-08-15 21:29 ` [patch V5 57/72] futex: Validate waiter correctly in futex_proxy_trylock_atomic() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 58/72] futex: Cleanup stale comments Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] futex: Clean up " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 59/72] futex: Clarify futex_requeue() PI handling Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 60/72] futex: Remove bogus condition for requeue PI Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 61/72] futex: Correct the number of requeued waiters for PI Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 62/72] futex: Restructure futex_requeue() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 63/72] futex: Clarify comment in futex_requeue() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 64/72] futex: Reorder sanity checks " Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 65/72] futex: Simplify handle_early_requeue_pi_wakeup() Thomas Gleixner
2021-08-17 20:14   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 66/72] futex: Prevent requeue_pi() lock nesting issue on RT Thomas Gleixner
2021-08-17 20:13   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 67/72] rtmutex: Prevent lockdep false positive with PI futexes Thomas Gleixner
2021-08-17 20:13   ` [tip: locking/core] locking/rtmutex: " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 68/72] preempt: Adjust PREEMPT_LOCK_OFFSET for RT Thomas Gleixner
2021-08-17 20:13   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 69/72] locking/rtmutex: Implement equal priority lock stealing Thomas Gleixner
2021-08-17 20:13   ` [tip: locking/core] " tip-bot2 for Gregory Haskins
2021-08-15 21:29 ` [patch V5 70/72] locking/rtmutex: Add adaptive spinwait mechanism Thomas Gleixner
2021-08-17 20:13   ` [tip: locking/core] " tip-bot2 for Steven Rostedt
2021-08-15 21:29 ` [patch V5 71/72] locking/spinlock/rt: Prepare for RT local_lock Thomas Gleixner
2021-08-17 20:13   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-15 21:29 ` [patch V5 72/72] locking/local_lock: Add PREEMPT_RT support Thomas Gleixner
2021-08-17 20:13   ` [tip: locking/core] " tip-bot2 for Thomas Gleixner
2021-08-16  9:21 ` [patch V5 00/72] locking, sched: The PREEMPT-RT locking infrastructure Sebastian Andrzej Siewior

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