From: Madhusudanan Kandasamy <kmadhu@linux.vnet.ibm.com>
Date: Thu, 10 Jul 2014 15:15:13 +0000 (+0530)
Subject: powerpc: Fail remap_4k_pfn() if PFN doesn't fit inside PTE
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~134^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eeb03a6eaa02e9171f91e385c52a69b159fc6117;p=pandora-kernel.git

powerpc: Fail remap_4k_pfn() if PFN doesn't fit inside PTE

remap_4k_pfn() silently truncates upper bits of input 4K PFN
if it cannot be contained in PTE. This leads invalid memory mapping and could
result in a system crash when the memory is accessed. This patch fails
remap_4k_pfn() and returns -EINVAL if the input 4K PFN cannot be contained in
PTE.

V3 : Added parentheses to protect 'pfn' and entire macro as suggested by Brian.
V2 : Rewritten to avoid helper function as suggested by Stephen Rothwell.

Signed-off-by: Madhusudanan Kandasamy <kmadhu@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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