From: Will Deacon <will.deacon@arm.com>
Date: Mon, 16 Feb 2015 18:38:20 +0000 (+0000)
Subject: iommu/io-pgtable-arm: Fix self-test WARNs on i386
X-Git-Tag: omap-for-v4.1/wl12xx-dt~30^2~5
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=367bd978b81c2c7bcdcacdd3156645a27fab0676;p=pandora-kernel.git

iommu/io-pgtable-arm: Fix self-test WARNs on i386

Various build/boot bots have reported WARNs being triggered by the ARM
iopgtable LPAE self-tests on i386 machines.

This boils down to two instances of right-shifting a 32-bit unsigned
long (i.e. an iova) by more than the size of the type. On 32-bit ARM,
this happens to give us zero, hence my testing didn't catch this
earlier.

This patch fixes the issue by using DIV_ROUND_UP and explicit case to
to avoid the erroneous shifts.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
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