Re: [RFC PATCH 24/32] mm/kasan: Convert to struct slab

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Tue, Nov 16, 2021 at 01:16:20AM +0100, Vlastimil Babka wrote:
> @@ -411,12 +412,12 @@ void __kasan_slab_free_mempool(void *ptr, unsigned long ip)
>  	 * !PageSlab() when the size provided to kmalloc is larger than
>  	 * KMALLOC_MAX_SIZE, and kmalloc falls back onto page_alloc.
>  	 */
> -	if (unlikely(!PageSlab(page))) {
> +	if (unlikely(!folio_test_slab(folio))) {
>  		if (____kasan_kfree_large(ptr, ip))
>  			return;
> -		kasan_poison(ptr, page_size(page), KASAN_FREE_PAGE, false);
> +		kasan_poison(ptr, folio_size(folio), KASAN_FREE_PAGE, false);
>  	} else {
> -		____kasan_slab_free(page->slab_cache, ptr, ip, false, false);
> +		____kasan_slab_free(folio_slab(folio)->slab_cache, ptr, ip, false, false);

I'd avoid this long line by doing:
		struct slab *slab = folio_slab(folio);
		____kasan_slab_free(slab->slab_cache, ptr, ip, false, false);