tree 8a4e0583cd0ef46d27e4725c58ece70f3253a3ad
parent f752ac4d7d96159776b0eea47489796bd90856fd
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1362046134 +0100
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1366200444 +0200

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>