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On s390 we only can enable hugepages if the underlying hardware/hypervisor
also does support this. Common code now would assume this to be
signaled by setting HPAGE_SHIFT to 0. But on s390, where we only
support one hugepage size, there is a link between HPAGE_SHIFT and
pageblock_order.
So instead of setting HPAGE_SHIFT to 0, we will implement the check for
the hardware capability.
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
7f9be77555