linux-kernel - [tip: locking/core] futex: Consistently use fshared as boolean

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Message-ID: <159503051506.4006.14566660709766514564.tip-bot2@tip-bot2>
Date:   Sat, 18 Jul 2020 00:01:55 -0000
From:   tip-bot2 for André Almeida 
        <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     andrealmeid@...labora.com, Thomas Gleixner <tglx@...utronix.de>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: locking/core] futex: Consistently use fshared as boolean

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     9261308598ad28b9a8a2237d881833e9f217244e
Gitweb:        https://git.kernel.org/tip/9261308598ad28b9a8a2237d881833e9f217244e
Author:        André Almeida <andrealmeid@...labora.com>
AuthorDate:    Thu, 02 Jul 2020 17:28:43 -03:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 18 Jul 2020 01:56:08 +02:00

futex: Consistently use fshared as boolean

Since fshared is only conveying true/false values, declare it as bool.

In get_futex_key() the usage of fshared can be restricted to the first part
of the function. If fshared is false the function is terminated early and
the subsequent code can use a constant 'true' instead of the variable.

Signed-off-by: André Almeida <andrealmeid@...labora.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/r/20200702202843.520764-5-andrealmeid@collabora.com

---
 kernel/futex.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index 362fbca..cda9175 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -476,7 +476,7 @@ static u64 get_inode_sequence_number(struct inode *inode)
 /**
  * get_futex_key() - Get parameters which are the keys for a futex
  * @uaddr:	virtual address of the futex
- * @fshared:	0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
+ * @fshared:	false for a PROCESS_PRIVATE futex, true for PROCESS_SHARED
  * @key:	address where result is stored.
  * @rw:		mapping needs to be read/write (values: FUTEX_READ,
  *              FUTEX_WRITE)
@@ -500,8 +500,8 @@ static u64 get_inode_sequence_number(struct inode *inode)
  *
  * lock_page() might sleep, the caller should not hold a spinlock.
  */
-static int
-get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_access rw)
+static int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key,
+			 enum futex_access rw)
 {
 	unsigned long address = (unsigned long)uaddr;
 	struct mm_struct *mm = current->mm;
@@ -538,7 +538,7 @@ get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, enum futex_a
 
 again:
 	/* Ignore any VERIFY_READ mapping (futex common case) */
-	if (unlikely(should_fail_futex(fshared)))
+	if (unlikely(should_fail_futex(true)))
 		return -EFAULT;
 
 	err = get_user_pages_fast(address, 1, FOLL_WRITE, &page);
@@ -626,7 +626,7 @@ again:
 		 * A RO anonymous page will never change and thus doesn't make
 		 * sense for futex operations.
 		 */
-		if (unlikely(should_fail_futex(fshared)) || ro) {
+		if (unlikely(should_fail_futex(true)) || ro) {
 			err = -EFAULT;
 			goto out;
 		}