linux-kernel - [PATCH] Don't compare unsigned variable for <0 in sys

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Message-Id: <200611282317.14020.jesper.juhl@gmail.com>
Date:	Tue, 28 Nov 2006 23:17:13 +0100
From:	Jesper Juhl <jesper.juhl@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...l.org>, Andrew Morton <akpm@...l.org>,
	trivial@...nel.org, Jesper Juhl <jesper.juhl@...il.com>
Subject: [PATCH] Don't compare unsigned variable for <0 in sys_prctl()


In kernel/sys.c::sys_prctl() the argument named 'arg2' is very clearly 
of type 'unsigned long', and when compiling with "gcc -W" gcc also warns :
  kernel/sys.c:2089: warning: comparison of unsigned expression < 0 is always false

So this patch removes the test of "arg2 < 0".

For those of us who compile their kernels with "-W" this gets rid of an 
annoying warning. For the rest of you it saves a few bytes of source code ;-)


Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>
---

diff --git a/kernel/sys.c b/kernel/sys.c
index 98489d8..086ea37 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2086,7 +2086,7 @@ asmlinkage long sys_prctl(int option, un
 			error = current->mm->dumpable;
 			break;
 		case PR_SET_DUMPABLE:
-			if (arg2 < 0 || arg2 > 1) {
+			if (arg2 > 1) {
 				error = -EINVAL;
 				break;
 			}


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