mm: Fix commit "mm: start tracking VMAs with maple tree"

Hold the lock for the destruction of the maple tree to avoid lockdep
issues - and potentially process_mrelease.

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>

diff --git a/mm/mmap.c b/mm/mmap.c
index f172f3aba90ff4bb8e5ae5313b3834cd87768efb..dbfd3576b6d0ab96c63c51ea432d9289154c9ea7 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3163,9 +3163,9 @@ void exit_mmap(struct mm_struct *mm)
 
        BUG_ON(count != mm->map_count);
 
-       mmap_write_unlock(mm);
        trace_exit_mmap(mm);
        __mt_destroy(&mm->mm_mt);
+       mmap_write_unlock(mm);
        vm_unacct_memory(nr_accounted);
 }