mm: numa: Do not account for a hinting fault if we raced

commit 1dd49bfa3465756b3ce72214b58a33e4afb67aa3 upstream.

If another task handled a hinting fault in parallel then do not double
account for it.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-5-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0164b09c1e99..7b09fe75799c 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1335,8 +1335,11 @@ int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
 
 check_same:
         spin_lock(&mm->page_table_lock);
-        if (unlikely(!pmd_same(pmd, *pmdp)))
+        if (unlikely(!pmd_same(pmd, *pmdp))) {
+                /* Someone else took our fault */
+                current_nid = -1;
                 goto out_unlock;
+        }
 clear_pmdnuma:
         pmd = pmd_mknonnuma(pmd);
         set_pmd_at(mm, haddr, pmdp, pmd);