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-rw-r--r--mm/pagewalk.c47
1 files changed, 37 insertions, 10 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 7b47a57..8b1a2ce 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -80,6 +80,37 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
return err;
}
+#ifdef CONFIG_HUGETLB_PAGE
+static unsigned long hugetlb_entry_end(struct hstate *h, unsigned long addr,
+ unsigned long end)
+{
+ unsigned long boundary = (addr & huge_page_mask(h)) + huge_page_size(h);
+ return boundary < end ? boundary : end;
+}
+
+static int walk_hugetlb_range(struct vm_area_struct *vma,
+ unsigned long addr, unsigned long end,
+ struct mm_walk *walk)
+{
+ struct hstate *h = hstate_vma(vma);
+ unsigned long next;
+ unsigned long hmask = huge_page_mask(h);
+ pte_t *pte;
+ int err = 0;
+
+ do {
+ next = hugetlb_entry_end(h, addr, end);
+ pte = huge_pte_offset(walk->mm, addr & hmask);
+ if (pte && walk->hugetlb_entry)
+ err = walk->hugetlb_entry(pte, hmask, addr, next, walk);
+ if (err)
+ return err;
+ } while (addr = next, addr != end);
+
+ return 0;
+}
+#endif
+
/**
* walk_page_range - walk a memory map's page tables with a callback
* @mm: memory map to walk
@@ -128,20 +159,16 @@ int walk_page_range(unsigned long addr, unsigned long end,
vma = find_vma(walk->mm, addr);
#ifdef CONFIG_HUGETLB_PAGE
if (vma && is_vm_hugetlb_page(vma)) {
- pte_t *pte;
- struct hstate *hs;
-
if (vma->vm_end < next)
next = vma->vm_end;
- hs = hstate_vma(vma);
- pte = huge_pte_offset(walk->mm,
- addr & huge_page_mask(hs));
- if (pte && !huge_pte_none(huge_ptep_get(pte))
- && walk->hugetlb_entry)
- err = walk->hugetlb_entry(pte, addr,
- next, walk);
+ /*
+ * Hugepage is very tightly coupled with vma, so
+ * walk through hugetlb entries within a given vma.
+ */
+ err = walk_hugetlb_range(vma, addr, next, walk);
if (err)
break;
+ pgd = pgd_offset(walk->mm, next);
continue;
}
#endif
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