ppc64: belong on sysconf to get current page size
ppc64: belong on sysconf to get current page size

Page size may change, so page size should be read through sysconf.

Suggested-by: Christopher Covington <a4bb60c1cee4bc57e495283536ad4f6d94bfb161@codeaurora.org>
Signed-off-by: Laurent Dufour <a59ffce977ae3d39bdc87f81ff88b229ad58db88@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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