mm: use linear_page_index() in do_fault()

do_fault() assumes that PAGE_SIZE is the same as PAGE_CACHE_SIZE.  Use
linear_page_index() to calculate pgoff in the correct units.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memory.c b/mm/memory.c
index 8adb5b7..032f05c 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3124,8 +3124,7 @@ static int do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
                unsigned long address, pte_t *page_table, pmd_t *pmd,
                unsigned int flags, pte_t orig_pte)
 {
-       pgoff_t pgoff = (((address & PAGE_MASK)
-                       - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+       pgoff_t pgoff = linear_page_index(vma, address);
 
        pte_unmap(page_table);
        /* The VMA was not fully populated on mmap() or missing VM_DONTEXPAND */