diff options
| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2013-06-20 14:30:14 +0530 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-06-21 16:01:53 +1000 |
| commit | f940f5289873af2ad2c4e73f88c24ad2b8fe3f87 (patch) | |
| tree | 2e5e623bb15d5f1db3e191236a88221fb83fd693 /arch/powerpc/include/asm/pgtable-ppc64-64k.h | |
| parent | db3d8534903c8a9617142975bec6db95acaba753 (diff) | |
powerpc/THP: Double the PMD table size for THP
THP code does PTE page allocation along with large page request and deposit them
for later use. This is to ensure that we won't have any failures when we split
hugepages to regular pages.
On powerpc we want to use the deposited PTE page for storing hash pte slot and
secondary bit information for the HPTEs. We use the second half
of the pmd table to save the deposted PTE page.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/pgtable-ppc64-64k.h')
| -rw-r--r-- | arch/powerpc/include/asm/pgtable-ppc64-64k.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/pgtable-ppc64-64k.h b/arch/powerpc/include/asm/pgtable-ppc64-64k.h index 45142d640720..a56b82fb0609 100644 --- a/arch/powerpc/include/asm/pgtable-ppc64-64k.h +++ b/arch/powerpc/include/asm/pgtable-ppc64-64k.h @@ -33,7 +33,8 @@ #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* Bits to mask out from a PMD to get to the PTE page */ -#define PMD_MASKED_BITS 0x1ff +/* PMDs point to PTE table fragments which are 4K aligned. */ +#define PMD_MASKED_BITS 0xfff /* Bits to mask out from a PGD/PUD to get to the PMD page */ #define PUD_MASKED_BITS 0x1ff |