lockdep: Print out additional debugging advice when we hit lockdep BUGs

[~andy/linux] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index e19328087534af9f77371866c9afe30c70e3ff89..2f3ea749c3184057559cc06ef60960d39bb4bac2 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -821,7 +821,7 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
        struct vm_area_struct *vma;
 
        /* check the cache first */
-       vma = mm->mmap_cache;
+       vma = ACCESS_ONCE(mm->mmap_cache);
        if (vma && vma->vm_start <= addr && vma->vm_end > addr)
                return vma;