On Tue, Apr 14, 2020 at 05:43:49PM -0700, Michel Lespinasse wrote: > @@ -47,7 +48,7 @@ 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_nested(&new->mmap_sem, 1); > + mmap_write_lock_nested(new, 1); This should have already been using SINGLE_DEPTH_NESTING. 1 is uninformative.
