linux-kernel - [PATCH 2/3] sched: Use clamp() and clamp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <0b02fa0f05c9cebca19cadce92cb8c85ee130ce0.1394022835.git.yangds.fnst@cn.fujitsu.com>
Date:	Wed, 5 Mar 2014 20:36:41 +0800
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	linux-kernel@...r.kernel.org
Cc:	fweisbec@...il.com, rostedt@...dmis.org, peterz@...radead.org,
	mingo@...hat.com, Dongsheng Yang <yangds.fnst@...fujitsu.com>
Subject: [PATCH 2/3] sched: Use clamp() and clamp_val() to make it more readable.

As Kees suggested, I use clamp() function to replace the if and
else branch, making it more readable and modular.

Suggested-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
---
 kernel/sched/core.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ee8004c..5273037 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3070,17 +3070,10 @@ SYSCALL_DEFINE1(nice, int, increment)
 	 * We don't have to worry. Conceptually one call occurs first
 	 * and we have a single winner.
 	 */
-	if (increment < -40)
-		increment = -40;
-	if (increment > 40)
-		increment = 40;
-
+	increment = clamp(increment, -40, 40);
 	nice = task_nice(current) + increment;
-	if (nice < MIN_NICE)
-		nice = MIN_NICE;
-	if (nice > MAX_NICE)
-		nice = MAX_NICE;
 
+	nice = clamp_val(nice, MIN_NICE, MAX_NICE);
 	if (increment < 0 && !can_nice(current, nice))
 		return -EPERM;
 
-- 
1.8.2.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/