From: "André Almeida" <andrealmeid@collabora.com>
To: linux-kernel@vger.kernel.org, tglx@linutronix.de, peterz@infradead.org
Cc: mingo@redhat.com, dvhart@infradead.org, kernel@collabora.com,
krisman@collabora.com,
"André Almeida" <andrealmeid@collabora.com>
Subject: [PATCH 2/4] futex: Remove needless goto's
Date: Wed, 27 May 2020 12:47:45 -0300 [thread overview]
Message-ID: <20200527154747.36931-3-andrealmeid@collabora.com> (raw)
In-Reply-To: <20200527154747.36931-1-andrealmeid@collabora.com>
As stated in the coding style documentation[1], "if there is no cleanup
needed then just return directly", instead of jumping to a label and
then returning. Remove such goto's and replace with a return statement.
When there's a ternary operator on the return value, replace with the
result of the operation when is logically possible to determine it by
the control flow.
[1] https://www.kernel.org/doc/html/latest/process/coding-style.html#centralized-exiting-of-functions
Signed-off-by: André Almeida <andrealmeid@collabora.com>
---
kernel/futex.c | 40 ++++++++++++++++------------------------
1 file changed, 16 insertions(+), 24 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c
index 1f0287a51dce..ec07de620d1e 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1604,13 +1604,13 @@ futex_wake(u32 __user *uaddr, unsigned int flags, int nr_wake, u32 bitset)
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &key, FUTEX_READ);
if (unlikely(ret != 0))
- goto out;
+ return ret;
hb = hash_futex(&key);
/* Make sure we really have tasks to wakeup */
if (!hb_waiters_pending(hb))
- goto out;
+ return ret;
spin_lock(&hb->lock);
@@ -1633,7 +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:
return ret;
}
@@ -1700,10 +1699,10 @@ futex_wake_op(u32 __user *uaddr1, unsigned int flags, u32 __user *uaddr2,
retry:
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
if (unlikely(ret != 0))
- goto out;
+ return ret;
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, FUTEX_WRITE);
if (unlikely(ret != 0))
- goto out;
+ return ret;
hb1 = hash_futex(&key1);
hb2 = hash_futex(&key2);
@@ -1721,13 +1720,13 @@ 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;
+ return ret;
}
if (op_ret == -EFAULT) {
ret = fault_in_user_writeable(uaddr2);
if (ret)
- goto out;
+ return ret;
}
if (!(flags & FLAGS_SHARED)) {
@@ -1770,7 +1769,6 @@ 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:
return ret;
}
@@ -1977,20 +1975,18 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
retry:
ret = get_futex_key(uaddr1, flags & FLAGS_SHARED, &key1, FUTEX_READ);
if (unlikely(ret != 0))
- goto out;
+ return ret;
ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2,
requeue_pi ? FUTEX_WRITE : FUTEX_READ);
if (unlikely(ret != 0))
- goto out;
+ return ret;
/*
* The check above which compares uaddrs is not sufficient for
* shared futexes. We need to compare the keys:
*/
- if (requeue_pi && match_futex(&key1, &key2)) {
- ret = -EINVAL;
- goto out;
- }
+ if (requeue_pi && match_futex(&key1, &key2))
+ return -EINVAL;
hb1 = hash_futex(&key1);
hb2 = hash_futex(&key2);
@@ -2010,7 +2006,7 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
ret = get_user(curval, uaddr1);
if (ret)
- goto out;
+ return ret;
if (!(flags & FLAGS_SHARED))
goto retry_private;
@@ -2076,7 +2072,7 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
ret = fault_in_user_writeable(uaddr2);
if (!ret)
goto retry;
- goto out;
+ return ret;
case -EBUSY:
case -EAGAIN:
/*
@@ -2195,8 +2191,6 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
double_unlock_hb(hb1, hb2);
wake_up_q(&wake_q);
hb_waiters_dec(hb2);
-
-out:
return ret ? ret : task_count;
}
@@ -2542,7 +2536,7 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
*/
if (q->pi_state->owner != current)
ret = fixup_pi_state_owner(uaddr, q, current);
- goto out;
+ return ret ? ret : locked;
}
/*
@@ -2555,7 +2549,7 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
*/
if (q->pi_state->owner == current) {
ret = fixup_pi_state_owner(uaddr, q, NULL);
- goto out;
+ return ret;
}
/*
@@ -2569,8 +2563,7 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
q->pi_state->owner);
}
-out:
- return ret ? ret : locked;
+ return ret;
}
/**
@@ -2667,7 +2660,7 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
ret = get_user(uval, uaddr);
if (ret)
- goto out;
+ return ret;
if (!(flags & FLAGS_SHARED))
goto retry_private;
@@ -2680,7 +2673,6 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
ret = -EWOULDBLOCK;
}
-out:
return ret;
}
--
2.26.2
next prev parent reply other threads:[~2020-05-27 15:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 15:47 [PATCH 0/4] futex: Minor code improvements André Almeida
2020-05-27 15:47 ` [PATCH 1/4] futex: Remove put_futex_key() André Almeida
2020-05-27 15:47 ` André Almeida [this message]
2020-05-27 15:47 ` [PATCH 3/4] futex: Remove unused or redundant includes André Almeida
2020-05-27 15:47 ` [PATCH 4/4] futex: Consistently use fshared as boolean André Almeida
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