From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 2 Jul 2009 19:05:10 +0000 (-0700)
Subject: x86: fix power-of-2 round_up/round_down macros
X-Git-Tag: v2.6.31-rc2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=43644679a1e80f53e6e0155ab75b1093ba3c0365;p=pandora-kernel.git

x86: fix power-of-2 round_up/round_down macros

These macros had two bugs:
 - the type of the mask was not correctly expanded to the full size of
   the argument being expanded, resulting in possible loss of high bits
   when mixing types.
 - the alignment argument was evaluated twice, despite the macro looking
   like a fancy function (but it really does need to be a macro, since
   it works on arbitrary integer types)

Noticed by Peter Anvin, and with a fix that is a modification of his
suggestion (bug noticed by Yinghai Lu).

Cc: Peter Anvin <hpa@zytor.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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