linux-kernel - [patch V4 39/68] locking/ww_mutex: Gather mutex

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Date:   Wed, 11 Aug 2021 14:23:18 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Davidlohr Bueso <dave@...olabs.net>,
        Mike Galbraith <efault@....de>
Subject: [patch V4 39/68] locking/ww_mutex: Gather mutex_waiter initialization

From: Peter Zijlstra <peterz@...radead.org>

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 kernel/locking/mutex-debug.c |    1 +
 kernel/locking/mutex.c       |   12 +++---------
 2 files changed, 4 insertions(+), 9 deletions(-)
---
--- a/kernel/locking/mutex-debug.c
+++ b/kernel/locking/mutex-debug.c
@@ -30,6 +30,7 @@ void debug_mutex_lock_common(struct mute
 	memset(waiter, MUTEX_DEBUG_INIT, sizeof(*waiter));
 	waiter->magic = waiter;
 	INIT_LIST_HEAD(&waiter->list);
+	waiter->ww_ctx = MUTEX_POISON_WW_CTX;
 }
 
 void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter)
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -980,17 +980,15 @@ static __always_inline int __sched
 	}
 
 	debug_mutex_lock_common(lock, &waiter);
+	waiter.task = current;
+	if (ww_ctx)
+		waiter.ww_ctx = ww_ctx;
 
 	lock_contended(&lock->dep_map, ip);
 
 	if (!use_ww_ctx) {
 		/* add waiting tasks to the end of the waitqueue (FIFO): */
 		__mutex_add_waiter(lock, &waiter, &lock->wait_list);
-
-
-#ifdef CONFIG_DEBUG_MUTEXES
-		waiter.ww_ctx = MUTEX_POISON_WW_CTX;
-#endif
 	} else {
 		/*
 		 * Add in stamp order, waking up waiters that must kill
@@ -999,12 +997,8 @@ static __always_inline int __sched
 		ret = __ww_mutex_add_waiter(&waiter, lock, ww_ctx);
 		if (ret)
 			goto err_early_kill;
-
-		waiter.ww_ctx = ww_ctx;
 	}
 
-	waiter.task = current;
-
 	set_current_state(state);
 	for (;;) {
 		/*