linux-kernel - [patch V3 37/64] locking/ww_mutex: Simplify lockdep annotation

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Date:   Thu, 05 Aug 2021 17:13:37 +0200
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 V3 37/64] locking/ww_mutex: Simplify lockdep annotation

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

No functional change.

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

---
 kernel/locking/mutex.c |   19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)
---
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -949,6 +949,10 @@ static __always_inline int __sched
 		 */
 		if (ww_ctx->acquired == 0)
 			ww_ctx->wounded = 0;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+		nest_lock = &ww_ctx->dep_map;
+#endif
 	}
 
 	preempt_disable();
@@ -1102,10 +1106,9 @@ static int __sched
 
 static int __sched
 __ww_mutex_lock(struct mutex *lock, unsigned int state, unsigned int subclass,
-		struct lockdep_map *nest_lock, unsigned long ip,
-		struct ww_acquire_ctx *ww_ctx)
+		unsigned long ip, struct ww_acquire_ctx *ww_ctx)
 {
-	return __mutex_lock_common(lock, state, subclass, nest_lock, ip, ww_ctx, true);
+	return __mutex_lock_common(lock, state, subclass, NULL, ip, ww_ctx, true);
 }
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
@@ -1185,8 +1188,7 @@ ww_mutex_lock(struct ww_mutex *lock, str
 
 	might_sleep();
 	ret =  __ww_mutex_lock(&lock->base, TASK_UNINTERRUPTIBLE,
-			       0, ctx ? &ctx->dep_map : NULL, _RET_IP_,
-			       ctx);
+			       0, _RET_IP_, ctx);
 	if (!ret && ctx && ctx->acquired > 1)
 		return ww_mutex_deadlock_injection(lock, ctx);
 
@@ -1201,8 +1203,7 @@ ww_mutex_lock_interruptible(struct ww_mu
 
 	might_sleep();
 	ret = __ww_mutex_lock(&lock->base, TASK_INTERRUPTIBLE,
-			      0, ctx ? &ctx->dep_map : NULL, _RET_IP_,
-			      ctx);
+			      0, _RET_IP_, ctx);
 
 	if (!ret && ctx && ctx->acquired > 1)
 		return ww_mutex_deadlock_injection(lock, ctx);
@@ -1376,7 +1377,7 @@ static noinline int __sched
 static noinline int __sched
 __ww_mutex_lock_slowpath(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
 {
-	return __ww_mutex_lock(&lock->base, TASK_UNINTERRUPTIBLE, 0, NULL,
+	return __ww_mutex_lock(&lock->base, TASK_UNINTERRUPTIBLE, 0,
 			       _RET_IP_, ctx);
 }
 
@@ -1384,7 +1385,7 @@ static noinline int __sched
 __ww_mutex_lock_interruptible_slowpath(struct ww_mutex *lock,
 					    struct ww_acquire_ctx *ctx)
 {
-	return __ww_mutex_lock(&lock->base, TASK_INTERRUPTIBLE, 0, NULL,
+	return __ww_mutex_lock(&lock->base, TASK_INTERRUPTIBLE, 0,
 			       _RET_IP_, ctx);
 }