From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Thu, 28 Feb 2013 10:08:54 +0000 (+0100)
Subject: s390/mm: zero page cache synonyms for zEC12
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~146^2~56
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7919e91b34316ee30b14334389e005eb2e9b8e39;p=pandora-kernel.git

s390/mm: zero page cache synonyms for zEC12

To avoid cache synonyms on System zEC12 32 independent zero pages are
required, one for each combination for bits 2**12 to 2**16 of the virtual
address. To avoid wasting too much memory on small virtual systems the
number of zero pages is limited to 4 if the memory size is less or equal
to 64MB.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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