From: Rolf Eike Beer <eike-kernel@sf-tec.de>
Date: Tue, 22 Sep 2009 23:44:03 +0000 (-0700)
Subject: Make sure the value in abs() does not get truncated if it is greater than 2^32
X-Git-Tag: v3.0~7714
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a49c59c042c63b432307c1bbf7dac5a104c786e6;p=platform%2Fkernel%2Flinux-amlogic.git

Make sure the value in abs() does not get truncated if it is greater than 2^32

abs() will truncate the input if is it outside the 2^32 range.  Fix that
by assuming `long' input.

This might generate worse code in the common case.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 63dcaec..d3cd23f 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -146,7 +146,7 @@ extern int _cond_resched(void);
 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
 
 #define abs(x) ({				\
-		int __x = (x);			\
+		long __x = (x);			\
 		(__x < 0) ? -__x : __x;		\
 	})