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From:   =?UTF-8?q?Andr=C3=A9=20Almeida?= <andrealmeid@collabora.com>
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        peterz@infradead.org
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        krisman@collabora.com,
        =?UTF-8?q?Andr=C3=A9=20Almeida?= <andrealmeid@collabora.com>
Subject: [PATCH 1/4] futex: Remove put_futex_key()
Date:   Wed, 27 May 2020 12:47:44 -0300
Message-Id: <20200527154747.36931-2-andrealmeid@collabora.com>
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Since 4b39f99c ("futex: Remove {get,drop}_futex_key_refs()"),
function put_futex_key() is empty. Remove all references for this
function and redundant labels.

Signed-off-by: André Almeida <andrealmeid@collabora.com>
---
 kernel/futex.c | 61 ++++++++++----------------------------------------
 1 file changed, 12 insertions(+), 49 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index b59532862bc0..1f0287a51dce 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -674,10 +674,6 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
 	return err;
 }
 
-static inline void put_futex_key(union futex_key *key)
-{
-}
-
 /**
  * fault_in_user_writeable() - Fault in user address and verify RW access
  * @uaddr:	pointer to faulting user space address
@@ -1614,7 +1610,7 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
 
 	/* Make sure we really have tasks to wakeup */
 	if (!hb_waiters_pending(hb))
-		goto out_put_key;
+		goto out;
 
 	spin_lock(&hb->lock);
 
@@ -1637,8 +1633,6 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
 
 	spin_unlock(&hb->lock);
 	wake_up_q(&wake_q);
-out_put_key:
-	put_futex_key(&key);
 out:
 	return ret;
 }
@@ -1709,7 +1703,7 @@ futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
 		goto out;
 	ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE);
 	if (unlikely(ret != 0))
-		goto out_put_key1;
+		goto out;
 
 	hb1 = hash_futex(&key1);
 	hb2 = hash_futex(&key2);
@@ -1727,13 +1721,13 @@ futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
 			 * an MMU, but we might get them from range checking
 			 */
 			ret = op_ret;
-			goto out_put_keys;
+			goto out;
 		}
 
 		if (op_ret == -EFAULT) {
 			ret = fault_in_user_writeable(uaddr2);
 			if (ret)
-				goto out_put_keys;
+				goto out;
 		}
 
 		if (!(flags & FLAGS_SHARED)) {
@@ -1741,8 +1735,6 @@ futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
 			goto retry_private;
 		}
 
-		put_futex_key(&key2);
-		put_futex_key(&key1);
 		cond_resched();
 		goto retry;
 	}
@@ -1778,10 +1770,6 @@ futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
 out_unlock:
 	double_unlock_hb(hb1, hb2);
 	wake_up_q(&wake_q);
-out_put_keys:
-	put_futex_key(&key2);
-out_put_key1:
-	put_futex_key(&key1);
 out:
 	return ret;
 }
@@ -1993,7 +1981,7 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
 	ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2,
 			    requeue_pi ? FUTEX_WRITE : FUTEX_READ);
 	if (unlikely(ret != 0))
-		goto out_put_key1;
+		goto out;
 
 	/*
 	 * The check above which compares uaddrs is not sufficient for
@@ -2001,7 +1989,7 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
 	 */
 	if (requeue_pi && match_futex(&key1, &key2)) {
 		ret = -EINVAL;
-		goto out_put_keys;
+		goto out;
 	}
 
 	hb1 = hash_futex(&key1);
@@ -2022,13 +2010,11 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
 
 			ret = get_user(curval, uaddr1);
 			if (ret)
-				goto out_put_keys;
+				goto out;
 
 			if (!(flags & FLAGS_SHARED))
 				goto retry_private;
 
-			put_futex_key(&key2);
-			put_futex_key(&key1);
 			goto retry;
 		}
 		if (curval != *cmpval) {
@@ -2087,8 +2073,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
 		case -EFAULT:
 			double_unlock_hb(hb1, hb2);
 			hb_waiters_dec(hb2);
-			put_futex_key(&key2);
-			put_futex_key(&key1);
 			ret = fault_in_user_writeable(uaddr2);
 			if (!ret)
 				goto retry;
@@ -2103,8 +2087,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
 			 */
 			double_unlock_hb(hb1, hb2);
 			hb_waiters_dec(hb2);
-			put_futex_key(&key2);
-			put_futex_key(&key1);
 			/*
 			 * Handle the case where the owner is in the middle of
 			 * exiting. Wait for the exit to complete otherwise
@@ -2214,10 +2196,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
 	wake_up_q(&wake_q);
 	hb_waiters_dec(hb2);
 
-out_put_keys:
-	put_futex_key(&key2);
-out_put_key1:
-	put_futex_key(&key1);
 out:
 	return ret ? ret : task_count;
 }
@@ -2694,7 +2672,6 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
 		if (!(flags & FLAGS_SHARED))
 			goto retry_private;
 
-		put_futex_key(&q->key);
 		goto retry;
 	}
 
@@ -2704,8 +2681,6 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
 	}
 
 out:
-	if (ret)
-		put_futex_key(&q->key);
 	return ret;
 }
 
@@ -2850,7 +2825,6 @@ static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
 			 * - EAGAIN: The user space value changed.
 			 */
 			queue_unlock(hb);
-			put_futex_key(&q.key);
 			/*
 			 * Handle the case where the owner is in the middle of
 			 * exiting. Wait for the exit to complete otherwise
@@ -2958,13 +2932,11 @@ static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
 		put_pi_state(pi_state);
 	}
 
-	goto out_put_key;
+	goto out;
 
 out_unlock_put_key:
 	queue_unlock(hb);
 
-out_put_key:
-	put_futex_key(&q.key);
 out:
 	if (to) {
 		hrtimer_cancel(&to->timer);
@@ -2977,12 +2949,11 @@ static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
 
 	ret = fault_in_user_writeable(uaddr);
 	if (ret)
-		goto out_put_key;
+		goto out;
 
 	if (!(flags & FLAGS_SHARED))
 		goto retry_private;
 
-	put_futex_key(&q.key);
 	goto retry;
 }
 
@@ -3111,16 +3082,13 @@ static int futex_unlock_pi(u32 __user *uaddr, unsigned int flags)
 out_unlock:
 	spin_unlock(&hb->lock);
 out_putkey:
-	put_futex_key(&key);
 	return ret;
 
 pi_retry:
-	put_futex_key(&key);
 	cond_resched();
 	goto retry;
 
 pi_faulted:
-	put_futex_key(&key);
 
 	ret = fault_in_user_writeable(uaddr);
 	if (!ret)
@@ -3262,7 +3230,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
 	 */
 	ret = futex_wait_setup(uaddr, val, flags, &q, &hb);
 	if (ret)
-		goto out_key2;
+		goto out;
 
 	/*
 	 * The check above which compares uaddrs is not sufficient for
@@ -3271,7 +3239,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
 	if (match_futex(&q.key, &key2)) {
 		queue_unlock(hb);
 		ret = -EINVAL;
-		goto out_put_keys;
+		goto out;
 	}
 
 	/* Queue the futex_q, drop the hb lock, wait for wakeup. */
@@ -3281,7 +3249,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
 	ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
 	spin_unlock(&hb->lock);
 	if (ret)
-		goto out_put_keys;
+		goto out;
 
 	/*
 	 * In order for us to be here, we know our q.key == key2, and since
@@ -3371,11 +3339,6 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
 		ret = -EWOULDBLOCK;
 	}
 
-out_put_keys:
-	put_futex_key(&q.key);
-out_key2:
-	put_futex_key(&key2);
-
 out:
 	if (to) {
 		hrtimer_cancel(&to->timer);
-- 
2.26.2