From: Jan Beulich <JBeulich@suse.com>
Date: Fri, 6 Jul 2012 14:07:48 +0000 (+0100)
Subject: x86/mm/mtrr: Fix alignment determination in range_to_mtrr()
X-Git-Tag: v3.6-rc1~164^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ba9a294141b106b7247649a5c3372d8284eca80;p=pandora-kernel.git

x86/mm/mtrr: Fix alignment determination in range_to_mtrr()

With the variable operated on being of "unsigned long" type,
neither ffs() nor fls() are suitable to use on them, as those
truncate their arguments to 32 bits. Using __ffs() and __fls()
respectively at once eliminates the need to subtract 1 from their
results.

Additionally, with the alignment value subsequently used as a
shift count, it must be enforced to be less than BITS_PER_LONG
(and on 64-bit there's no need for it to be any smaller).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/4FF70D54020000780008E179@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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