From eeb03a6eaa02e9171f91e385c52a69b159fc6117 Mon Sep 17 00:00:00 2001
From: Madhusudanan Kandasamy <kmadhu@linux.vnet.ibm.com>
Date: Thu, 10 Jul 2014 20:45:13 +0530
Subject: [PATCH] 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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