1 files changed, 1 insertions, 1 deletions

diff --git a/arch/um/include/asm/mmu_context.h b/arch/um/include/asm/mmu_context.h
index 9f4b4bb78120..00cefd33afdd 100644
--- a/arch/um/include/asm/mmu_context.h
+++ b/arch/um/include/asm/mmu_context.h
@@ -52,7 +52,7 @@ static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
          * when the new ->mm is used for the first time.
          */
         __switch_mm(&new->context.id);
-        down_write(&new->mmap_sem);
+        down_write_nested(&new->mmap_sem, 1);
         uml_setup_stubs(new);
         up_write(&new->mmap_sem);
 }