Re: [RFC][PATCH 2/4] mm, slub: implement slub allocate post callback for page_owner

[Matthew Wilcox]

On Thu, Nov 09, 2023 at 11:25:19AM +0800, Jeff Xie wrote:
> +#ifdef CONFIG_PAGE_OWNER
> +static int slab_alloc_post_page_owner(struct folio *folio, struct task_struct *tsk,
> +			void *data, char *kbuf, size_t count)
> +{
> +	int ret;
> +	struct kmem_cache *kmem_cache = data;
> +
> +	ret = scnprintf(kbuf, count, "SLAB_PAGE slab_name:%s\n", kmem_cache->name);
> +
> +	return ret;
> +}
> +#endif

Or we could do this typesafely ...

	struct slab *slab = folio_slab(folio);
	struct kmem_cache *kmem_cache = slab->slab_cache;

... and then there's no need to pass in a 'data' to the function.