[PATCH] mm: do_swap_page race major

Small adjustment: do_swap_page should report its !pte_same race as a major
fault if it had to read into swap cache, because whatever raced with it will
have found page already in cache and reported minor fault.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/memory.c b/mm/memory.c
index bc62963..a25ee1d 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1728,10 +1728,8 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
         */
        spin_lock(&mm->page_table_lock);
        page_table = pte_offset_map(pmd, address);
-       if (unlikely(!pte_same(*page_table, orig_pte))) {
-               ret = VM_FAULT_MINOR;
+       if (unlikely(!pte_same(*page_table, orig_pte)))
                goto out_nomap;
-       }
 
        if (unlikely(!PageUptodate(page))) {
                ret = VM_FAULT_SIGBUS;