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arm64: Re-enable support for contiguous hugepages 

also known as -

Revert "Revert "Revert "commit 66b3923a1a ("arm64: hugetlb: add
support for PTE contiguous bit")"""

Now that our hugetlb implementation is compliant with the
break-before-make requirements of the architecture and we have addressed
some of the issues in core code required for properly dealing with
hardware poisoning of contiguous hugepages let's re-enable support for
contiguous hugepages.

This reverts commit 6ae979ab39.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Punit Agrawal 2017-08-22 11:42:48 +01:00 committed by Catalin Marinas
parent a8d623eefd
commit 5cd028b9d9
1 changed files with 14 additions and 0 deletions
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14
arch/arm64/mm/hugetlbpage.c
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@ -408,6 +408,10 @@ static __init int setup_hugepagesz(char *opt)
hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
} else if (ps == PUD_SIZE) {
hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
} else if (ps == (PAGE_SIZE * CONT_PTES)) {
hugetlb_add_hstate(CONT_PTE_SHIFT);
} else if (ps == (PMD_SIZE * CONT_PMDS)) {
hugetlb_add_hstate((PMD_SHIFT + CONT_PMD_SHIFT) - PAGE_SHIFT);
} else {
hugetlb_bad_size();
pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10);
@ -416,3 +420,13 @@ static __init int setup_hugepagesz(char *opt)
return 1;
}
__setup("hugepagesz=", setup_hugepagesz);
#ifdef CONFIG_ARM64_64K_PAGES
static __init int add_default_hugepagesz(void)
{
if (size_to_hstate(CONT_PTES * PAGE_SIZE) == NULL)
hugetlb_add_hstate(CONT_PTE_SHIFT);
return 0;
}
arch_initcall(add_default_hugepagesz);
#endif