powerpc: Reduce the PTE_INDEX_SIZE
authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Sun, 28 Apr 2013 09:37:31 +0000 (09:37 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tue, 30 Apr 2013 06:00:00 +0000 (16:00 +1000)
commit419df06eea5bfa815e3a78e0aad6cfb320c1654f
tree52fd09dab6b9ddb7895107aa66f8bb231bf04811
parente2b3d202d1dba8f3546ed28224ce485bc50010be
powerpc: Reduce the PTE_INDEX_SIZE

This make one PMD cover 16MB range. That helps in easier implementation of THP
on power. THP core code make use of one pmd entry to track the hugepage and
the range mapped by a single pmd entry should be equal to the hugepage size
supported by the hardware.

This also switch PGD to cover 16GB. That is needed so that we can simplify the
hugetlb page walking code so that we have same pte format for explicit hugepage
and THP hugepage.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/include/asm/pgtable-ppc64-64k.h