From: Martin K. Petersen <martin.petersen@oracle.com>
Date: Mon, 15 Mar 2010 11:46:51 +0000 (+0100)
Subject: block: Fix overrun in lcm() and move it to lib
X-Git-Tag: v2.6.34-rc4~11^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2cda2728aa1c8c006418a24f867b25e5eb7a32e2;p=pandora-kernel.git

block: Fix overrun in lcm() and move it to lib

lcm() was defined to take integer-sized arguments.  The supplied
arguments are multiplied, however, causing us to overflow given
sufficiently large input.  That in turn led to incorrect optimal I/O
size reporting in some cases (RAID over RAID).

Switch lcm() over to unsigned long similar to gcd() and move the
function from blk-settings.c to lib.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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