linux-kernel - [tip:locking/core] locking/lockdep: Remove redundant argument in check

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Date:   Mon, 3 Jun 2019 06:18:04 -0700
From:   tip-bot for Yuyang Du <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, peterz@...radead.org, duyuyang@...il.com,
        hpa@...or.com, torvalds@...ux-foundation.org,
        linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: [tip:locking/core] locking/lockdep: Remove redundant argument in
 check_deadlock

Commit-ID:  4609c4f963f353613812f999bb027aac795bcde8
Gitweb:     https://git.kernel.org/tip/4609c4f963f353613812f999bb027aac795bcde8
Author:     Yuyang Du <duyuyang@...il.com>
AuthorDate: Mon, 6 May 2019 16:19:33 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 3 Jun 2019 11:55:49 +0200

locking/lockdep: Remove redundant argument in check_deadlock

In check_deadlock(), the third argument read comes from the second
argument hlock so that it can be removed. 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/20190506081939.74287-18-duyuyang@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/lockdep.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index b2ca20aa69aa..be4c1348ddcd 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -2246,7 +2246,7 @@ print_deadlock_bug(struct task_struct *curr, struct held_lock *prev,
  * Returns: 0 on deadlock detected, 1 on OK, 2 on recursive read
  */
 static int
-check_deadlock(struct task_struct *curr, struct held_lock *next, int read)
+check_deadlock(struct task_struct *curr, struct held_lock *next)
 {
 	struct held_lock *prev;
 	struct held_lock *nest = NULL;
@@ -2265,7 +2265,7 @@ check_deadlock(struct task_struct *curr, struct held_lock *next, int read)
 		 * Allow read-after-read recursion of the same
 		 * lock class (i.e. read_lock(lock)+read_lock(lock)):
 		 */
-		if ((read == 2) && prev->read)
+		if ((next->read == 2) && prev->read)
 			return 2;
 
 		/*
@@ -2839,7 +2839,7 @@ static int validate_chain(struct task_struct *curr,
 		 * The simple case: does the current hold the same lock
 		 * already?
 		 */
-		int ret = check_deadlock(curr, hlock, hlock->read);
+		int ret = check_deadlock(curr, hlock);
 
 		if (!ret)
 			return 0;