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powerpc: Reduce the PTE_INDEX_SIZE

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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>
This commit is contained in:
Aneesh Kumar K.V 2013-04-28 09:37:31 +00:00 committed by Benjamin Herrenschmidt
parent e2b3d202d1
commit 419df06eea
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/include/asm/pgtable-ppc64-64k.h
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@ -4,10 +4,10 @@
#include <asm-generic/pgtable-nopud.h>
#define PTE_INDEX_SIZE 12
#define PMD_INDEX_SIZE 12
#define PTE_INDEX_SIZE 8
#define PMD_INDEX_SIZE 10
#define PUD_INDEX_SIZE 0
#define PGD_INDEX_SIZE 6
#define PGD_INDEX_SIZE 12
#ifndef __ASSEMBLY__
#define PTE_TABLE_SIZE (sizeof(real_pte_t) << PTE_INDEX_SIZE)