linux-kernel - [tip:locking/core] locking/lockdep: Consolidate lock usage bit initialization

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Date:   Mon, 3 Jun 2019 06:20:58 -0700
From:   tip-bot for Yuyang Du <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, mingo@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, duyuyang@...il.com,
        torvalds@...ux-foundation.org, peterz@...radead.org
Subject: [tip:locking/core] locking/lockdep: Consolidate lock usage bit
 initialization

Commit-ID:  091806515124b20f8cff7927b4b7ff399483b109
Gitweb:     https://git.kernel.org/tip/091806515124b20f8cff7927b4b7ff399483b109
Author:     Yuyang Du <duyuyang@...il.com>
AuthorDate: Mon, 6 May 2019 16:19:37 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 3 Jun 2019 11:55:51 +0200

locking/lockdep: Consolidate lock usage bit initialization

Lock usage bit initialization is consolidated into one function
mark_usage(). Trivial readability improvement. No functional change.

Signed-off-by: Yuyang Du <duyuyang@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: bvanassche@....org
Cc: frederic@...nel.org
Cc: ming.lei@...hat.com
Cc: will.deacon@....com
Link: https://lkml.kernel.org/r/20190506081939.74287-22-duyuyang@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/lockdep.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 63b82921698d..1123e7e6c78d 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -3460,8 +3460,12 @@ void trace_softirqs_off(unsigned long ip)
 		debug_atomic_inc(redundant_softirqs_off);
 }
 
-static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
+static int
+mark_usage(struct task_struct *curr, struct held_lock *hlock, int check)
 {
+	if (!check)
+		goto lock_used;
+
 	/*
 	 * If non-trylock use in a hardirq or softirq context, then
 	 * mark the lock as used in these contexts:
@@ -3505,6 +3509,11 @@ static int mark_irqflags(struct task_struct *curr, struct held_lock *hlock)
 		}
 	}
 
+lock_used:
+	/* mark it as used: */
+	if (!mark_lock(curr, hlock, LOCK_USED))
+		return 0;
+
 	return 1;
 }
 
@@ -3546,8 +3555,8 @@ int mark_lock_irq(struct task_struct *curr, struct held_lock *this,
 	return 1;
 }
 
-static inline int mark_irqflags(struct task_struct *curr,
-		struct held_lock *hlock)
+static inline int
+mark_usage(struct task_struct *curr, struct held_lock *hlock, int check)
 {
 	return 1;
 }
@@ -3833,11 +3842,8 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
 #endif
 	hlock->pin_count = pin_count;
 
-	if (check && !mark_irqflags(curr, hlock))
-		return 0;
-
-	/* mark it as used: */
-	if (!mark_lock(curr, hlock, LOCK_USED))
+	/* Initialize the lock usage bit */
+	if (!mark_usage(curr, hlock, check))
 		return 0;
 
 	/*