linux-kernel - [PATCH] Fix roundup_pow_of

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Message-Id: <200705172356.57620.eike-kernel@sf-tec.de>
Date:	Thu, 17 May 2007 23:56:56 +0200
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org
Subject: [PATCH] Fix roundup_pow_of_two(1)

Fix roundup_pow_of_two(1)

1 is a power of two, therefore roundup_pow_of_two(1) should return 1. It does
in case the argument is a variable but in case it's a constant it behaves
wrong and returns 0. Probably nobody ever did it so this was never noticed.

Signed-off-by: Rolf Eike Beer <eike-kernel@...tec.de>

---
commit 01ceeffac83011f0b5021013cc4abd1c4f291df5
tree 7da59df51617d7cebd55e4361019181645a17e10
parent ab35916f807eb4f2019a208e96cb0bddbb91dfc3
author Rolf Eike Beer <eike-kernel@...tec.de> Thu, 17 May 2007 23:43:54 +0200
committer Rolf Eike Beer <eike-kernel@...tec.de> Thu, 17 May 2007 23:43:54 +0200

 include/linux/log2.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/log2.h b/include/linux/log2.h
index 57e641e..1b8a2c1 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -159,7 +159,7 @@ unsigned long __roundup_pow_of_two(unsigned long n)
 #define roundup_pow_of_two(n)			\
 (						\
 	__builtin_constant_p(n) ? (		\
-		(n == 1) ? 0 :			\
+		(n == 1) ? 1 :			\
 		(1UL << (ilog2((n) - 1) + 1))	\
 				   ) :		\
 	__roundup_pow_of_two(n)			\
-
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