linux-kernel - [tip:locking/core] futex: Remove pointless put_pi

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Message-ID: <tip-4959f2de11ca532a120a337429e5576fd283700f@git.kernel.org>
Date:	Sun, 20 Dec 2015 05:19:42 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, dave@...olabs.net, mingo@...nel.org,
	darren@...art.com, Andy_Lowe@...tor.com, tglx@...utronix.de,
	hpa@...or.com, peterz@...radead.org
Subject: [tip:locking/core] futex:
  Remove pointless put_pi_state calls in requeue()

Commit-ID:  4959f2de11ca532a120a337429e5576fd283700f
Gitweb:     http://git.kernel.org/tip/4959f2de11ca532a120a337429e5576fd283700f
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sat, 19 Dec 2015 20:07:40 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 20 Dec 2015 12:43:25 +0100

futex: Remove pointless put_pi_state calls in requeue()

In the error handling cases we neither have pi_state nor a reference
to it. Remove the pointless code.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Darren Hart <darren@...art.com>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Bhuvanesh_Surachari@...tor.com
Cc: Andy Lowe <Andy_Lowe@...tor.com>
Link: http://lkml.kernel.org/r/20151219200607.432780944@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/futex.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index 20c4683..dcec018 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1735,9 +1735,9 @@ retry_private:
 		case 0:
 			/* We hold a reference on the pi state. */
 			break;
+
+			/* If the above failed, then pi_state is NULL */
 		case -EFAULT:
-			put_pi_state(pi_state);
-			pi_state = NULL;
 			double_unlock_hb(hb1, hb2);
 			hb_waiters_dec(hb2);
 			put_futex_key(&key2);
@@ -1753,8 +1753,6 @@ retry_private:
 			 *   exit to complete.
 			 * - The user space value changed.
 			 */
-			put_pi_state(pi_state);
-			pi_state = NULL;
 			double_unlock_hb(hb1, hb2);
 			hb_waiters_dec(hb2);
 			put_futex_key(&key2);
--
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