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-rw-r--r--mm/hugetlb.c34
1 files changed, 25 insertions, 9 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index fdbbbb90caa..cf8225108b2 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -376,20 +376,15 @@ out:
return page;
}
-int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
- unsigned long address, int write_access)
+int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long address, pte_t *ptep)
{
int ret = VM_FAULT_SIGBUS;
unsigned long idx;
unsigned long size;
- pte_t *pte;
struct page *page;
struct address_space *mapping;
- pte = huge_pte_alloc(mm, address);
- if (!pte)
- goto out;
-
mapping = vma->vm_file->f_mapping;
idx = ((address - vma->vm_start) >> HPAGE_SHIFT)
+ (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
@@ -408,11 +403,11 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
goto backout;
ret = VM_FAULT_MINOR;
- if (!pte_none(*pte))
+ if (!pte_none(*ptep))
goto backout;
add_mm_counter(mm, file_rss, HPAGE_SIZE / PAGE_SIZE);
- set_huge_pte_at(mm, address, pte, make_huge_pte(vma, page));
+ set_huge_pte_at(mm, address, ptep, make_huge_pte(vma, page));
spin_unlock(&mm->page_table_lock);
unlock_page(page);
out:
@@ -426,6 +421,27 @@ backout:
goto out;
}
+int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
+ unsigned long address, int write_access)
+{
+ pte_t *ptep;
+ pte_t entry;
+
+ ptep = huge_pte_alloc(mm, address);
+ if (!ptep)
+ return VM_FAULT_OOM;
+
+ entry = *ptep;
+ if (pte_none(entry))
+ return hugetlb_no_page(mm, vma, address, ptep);
+
+ /*
+ * We could get here if another thread instantiated the pte
+ * before the test above.
+ */
+ return VM_FAULT_MINOR;
+}
+
int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
struct page **pages, struct vm_area_struct **vmas,
unsigned long *position, int *length, int i)