From: David Daney <david.daney@cavium.com>
Date: Tue, 24 Feb 2015 23:35:34 +0000 (-0800)
Subject: MIPS: Expand __swp_offset() to carry 40 significant bits for 64-bit kernel.
X-Git-Tag: omap-for-v4.1/fixes-rc1~111^2~110
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5ae03b1220ac22b823d8414997329806db16020c;p=pandora-kernel.git

MIPS: Expand __swp_offset() to carry 40 significant bits for 64-bit kernel.

With CONFIG_MIGRATION, the PFN of the migrating pages is stored in
__swp_offset(), so we must have enough bits to store the largest
possible PFN.  OCTEON NUMA systems have 41 bits of physical address
space, so with 4K pages (12-bits), we need at least 29 bits to store
the PFN.

The current width of 24-bits is too narrow, so expand it all the way
out to 40-bits.  This leaves the low order 16 bits as zero which does
not interfere with any of the PTE bits.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9315/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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