Re: [PATCH v4 07/12] mm: enable lazy_mmu sections to nest

[David Hildenbrand]

  static inline void lazy_mmu_mode_pause(void)
  {
+       struct lazy_mmu_state *state = &current->lazy_mmu_state;
+
+       VM_WARN_ON(state->nesting_level == 0 || !state->active);
+
+       state->active = false;
        arch_leave_lazy_mmu_mode();

Just one question:

Don't we want to allow for pause/resume when not enabled? Would seem 
valid to me, because pause/resume code should actually not worry about 
that, right?

if (!state->nesting_level) {
        VM_WARN_ON(state->active);
        return;
}
VM_WARN_ON(!state->active);
state->active = false;
arch_leave_lazy_mmu_mode();

--
Cheers

David / dhildenb