mm: fix false-positive warning on exit due mm_nr_pmds(mm)

[linux-beck.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index c99098c5264125c99e872ce29c14e6a3458d5f30..66e19c251581d1ddf52090bc37a23c645d19dd80 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -606,6 +606,14 @@ static void check_mm(struct mm_struct *mm)
                        printk(KERN_ALERT "BUG: Bad rss-counter state "
                                          "mm:%p idx:%d val:%ld\n", mm, i, x);
        }
+
+       if (atomic_long_read(&mm->nr_ptes))
+               pr_alert("BUG: non-zero nr_ptes on freeing mm: %ld\n",
+                               atomic_long_read(&mm->nr_ptes));
+       if (mm_nr_pmds(mm))
+               pr_alert("BUG: non-zero nr_pmds on freeing mm: %ld\n",
+                               mm_nr_pmds(mm));
+
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
        VM_BUG_ON_MM(mm->pmd_huge_pte, mm);
 #endif