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-rw-r--r--mm/memory.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 02fc6b1047b..262e3eb6601 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -998,19 +998,24 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
goto no_page_table;
pud = pud_offset(pgd, address);
- if (pud_none(*pud) || unlikely(pud_bad(*pud)))
+ if (pud_none(*pud))
+ goto no_page_table;
+ if (pud_huge(*pud)) {
+ BUG_ON(flags & FOLL_GET);
+ page = follow_huge_pud(mm, address, pud, flags & FOLL_WRITE);
+ goto out;
+ }
+ if (unlikely(pud_bad(*pud)))
goto no_page_table;
-
+
pmd = pmd_offset(pud, address);
if (pmd_none(*pmd))
goto no_page_table;
-
if (pmd_huge(*pmd)) {
BUG_ON(flags & FOLL_GET);
page = follow_huge_pmd(mm, address, pmd, flags & FOLL_WRITE);
goto out;
}
-
if (unlikely(pmd_bad(*pmd)))
goto no_page_table;
@@ -1567,6 +1572,8 @@ static int apply_to_pmd_range(struct mm_struct *mm, pud_t *pud,
unsigned long next;
int err;
+ BUG_ON(pud_huge(*pud));
+
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
return -ENOMEM;