vma_addjust_trans_huge() splits pmd if it's crossing VMA boundary. During split we munlock the huge page which requires rmap walk. rmap wants to take the lock on its own.
Signed-off-by: Kirill A. Shutemov <[email protected]> --- mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 2f2415a7a688..c9d0c412b6dd 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -802,6 +802,8 @@ again: remove_next = 1 + (end > next->vm_end); } } + vma_adjust_trans_huge(vma, start, end, adjust_next); + if (file) { mapping = file->f_mapping; root = &mapping->i_mmap; @@ -822,8 +824,6 @@ again: remove_next = 1 + (end > next->vm_end); } } - vma_adjust_trans_huge(vma, start, end, adjust_next); - anon_vma = vma->anon_vma; if (!anon_vma && adjust_next) anon_vma = next->anon_vma; -- 2.7.0
