huge_pte_offset() was updated to correctly handle swap entries for
hugepages. With the addition of the size parameter, it is now possible
to disambiguate whether the request is for a regular hugepage or a
contiguous hugepage.
Fix huge_pte_offset() for contiguous hugepages by using the size to find
the correct page table entry.
Signed-off-by: Punit Agrawal <punit.agrawal@xxxxxxx>
Cc: David Woods <dwoods@xxxxxxxxxxxx>
---
arch/arm64/mm/hugetlbpage.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index d3a6713048a2..09e79785c019 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -210,6 +210,7 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
+ pte_t *pte;
pgd = pgd_offset(mm, addr);
pr_debug("%s: addr:0x%lx pgd:%p\n", __func__, addr, pgd);
@@ -217,19 +218,29 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
return NULL;
pud = pud_offset(pgd, addr);
- if (pud_none(*pud))
+ if (pud_none(*pud) && sz != PUD_SIZE)
return NULL;
/* swap or huge page */
if (!pud_present(*pud) || pud_huge(*pud))
return (pte_t *)pud;
/* table; check the next level */
+ if (sz == CONT_PMD_SIZE)
+ addr &= CONT_PMD_MASK;
+
pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd))
+ if (pmd_none(*pmd) &&
+ !(sz == PMD_SIZE || sz == CONT_PMD_SIZE))
return NULL;
if (!pmd_present(*pmd) || pmd_huge(*pmd))
return (pte_t *)pmd;
+ if (sz == CONT_PTE_SIZE) {
+ pte = pte_offset_kernel(
+ pmd, (addr & CONT_PTE_MASK));
+ return pte;
+ }
+
return NULL;
}
--
2.13.2
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