On Sun, Apr 08, 2018 at 07:49:25PM -0700, Matthew Wilcox wrote:
> @@ -2714,8 +2714,10 @@ static __always_inline void *slab_alloc_node(struct kmem_cache *s,
> stat(s, ALLOC_FASTPATH);
> }
>
> - if (unlikely(gfpflags & __GFP_ZERO) && object)
> - memset(object, 0, s->object_size);
> + if (unlikely(gfpflags & __GFP_ZERO) && object) {
> + if (!WARN_ON_ONCE(s->ctor))
> + memset(object, 0, s->object_size);
> + }
>
> slab_post_alloc_hook(s, gfpflags, 1, &object);
This looks like a useful check to have. But maybe behind DEBUG_VM?
