1 files changed, 4 insertions, 0 deletions

diff --git a/fs/aio.c b/fs/aio.c
index 06d7d4390fe7..4f641abac3c0 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -567,6 +567,10 @@ static void use_mm(struct mm_struct *mm)
         atomic_inc(&mm->mm_count);
         tsk->mm = mm;
         tsk->active_mm = mm;
+        /*
+         * Note that on UML this *requires* PF_BORROWED_MM to be set, otherwise
+         * it won't work. Update it accordingly if you change it here
+         */
         activate_mm(active_mm, mm);
         task_unlock(tsk);