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[POWERPC] Add hugepagesz boot-time parameter

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This adds the hugepagesz boot-time parameter for ppc64.  It lets one
pick the size for huge pages.  The choices available are 64K and 16M
when the base page size is 4k.  It defaults to 16M (previously the
only only choice) if nothing or an invalid choice is specified.

Tested 64K huge pages successfully with the libhugetlbfs 1.2.

Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Jon Tollefson
2008-01-04 09:59:50 +11:00
committed by Paul Mackerras
parent 5b14e5f9dd
commit 4ec161cf73
4 changed files with 98 additions and 34 deletions
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11
arch/powerpc/mm/hash_utils_64.c
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@@ -369,18 +369,11 @@ static void __init htab_init_page_sizes(void)
* on what is available
*/
if (mmu_psize_defs[MMU_PAGE_16M].shift)
mmu_huge_psize = MMU_PAGE_16M;
set_huge_psize(MMU_PAGE_16M);
/* With 4k/4level pagetables, we can't (for now) cope with a
* huge page size < PMD_SIZE */
else if (mmu_psize_defs[MMU_PAGE_1M].shift)
mmu_huge_psize = MMU_PAGE_1M;
/* Calculate HPAGE_SHIFT and sanity check it */
if (mmu_psize_defs[mmu_huge_psize].shift > MIN_HUGEPTE_SHIFT &&
mmu_psize_defs[mmu_huge_psize].shift < SID_SHIFT)
HPAGE_SHIFT = mmu_psize_defs[mmu_huge_psize].shift;
else
HPAGE_SHIFT = 0; /* No huge pages dude ! */
set_huge_psize(MMU_PAGE_1M);
#endif /* CONFIG_HUGETLB_PAGE */
}