The patch titled
Subject: mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2
has been added to the -mm tree. Its filename is
mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2.patch
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------------------------------------------------------
From: Punit Agrawal <punit.agrawal@xxxxxxx>
Subject: mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2
Signed-off-by: Punit Agrawal <punit.agrawal@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Steve Capper <steve.capper@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/hugetlb.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff -puN mm/hugetlb.c~mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2 mm/hugetlb.c
--- a/mm/hugetlb.c~mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2
+++ a/mm/hugetlb.c
@@ -4604,8 +4604,10 @@ pte_t *huge_pte_alloc(struct mm_struct *
* huge_pte_offset() - Walk the page table to resolve the hugepage
* entry at address @addr
*
- * Return: Pointer to page table or swap entry (PUD or PMD) for address @addr
- * or NULL if the entry is p*d_none().
+ * Return: Pointer to page table or swap entry (PUD or PMD) for
+ * address @addr, or NULL if a p*d_none() entry is encountered and the
+ * size @sz doesn't match the hugepage size at this level of the page
+ * table.
*/
pte_t *huge_pte_offset(struct mm_struct *mm,
unsigned long addr, unsigned long sz)
@@ -4623,18 +4625,18 @@ pte_t *huge_pte_offset(struct mm_struct
return NULL;
pud = pud_offset(p4d, addr);
- if (pud_none(*pud))
+ if (sz != PUD_SIZE && pud_none(*pud))
return NULL;
/* hugepage or swap? */
if (pud_huge(*pud) || !pud_present(*pud))
return (pte_t *)pud;
pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd))
+ if (sz != PMD_SIZE && pmd_none(*pmd))
return NULL;
/* hugepage or swap? */
if (pmd_huge(*pmd) || !pmd_present(*pmd))
- return (pte_t *) pmd;
+ return (pte_t *)pmd;
return NULL;
}
_
Patches currently in -mm which might be from punit.agrawal@xxxxxxx are
mm-hugetlb-make-huge_pte_offset-consistent-and-document-behaviour.patch
mm-hugetlbc-make-huge_pte_offset-consistent-and-document-behaviour-v2.patch
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