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

Matthew Wilcox
2023-11-09T14:06:08Z

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.