[Devel] RE: [PATCH v8 1/9] Basic kernel memory functionality for the Memory Controller

[David Laight]

> How about this?
> 
>          val = !!val;
> 
>          /*
>           * This follows the same hierarchy restrictions than
>           * mem_cgroup_hierarchy_write()
>           */
>          if (!parent || !parent->use_hierarchy) {
>                  if (list_empty(&cgroup->children))
>                          memcg->kmem_independent_accounting = val;
>                  else
>                          return -EBUSY;
>          }
>          else
>                  return -EINVAL;
> 
>          return 0;

Inverting the tests gives easier to read code:

	if (parent && parent->user_hierarchy)
		return -EINVAL;
	if (!list_empty(&cgroup->children))
		return -EBUSY;
	memcg->kmem_independent_accounting = val != 0;
	return 0;

NFI about the logic...
On the face of it the tests don't seem related to each other
or to the assignment!

	David