Re: [RFC PATCH V2 1/9] mm/slab: move SLUB alloc hooks to common mm/slab.h

[Christoph Lameter <cl@linux.com>]

On Tue, 8 Dec 2015, Jesper Dangaard Brouer wrote:

> +/* Q: Howto handle this nicely? below includes are needed for alloc hooks
> + *
> + * e.g. mm/mempool.c and mm/slab_common.c does not include kmemcheck.h
> + * including it here solves the probem, but should they include it
> + * themselves?
> + */

Including in mm/slab.h is enough.

> +#ifdef CONFIG_SLUB

Move this into slab_ksize?

> +static inline size_t slab_ksize(const struct kmem_cache *s)
> +{
> +#ifdef CONFIG_SLUB_DEBUG
> +	/*
> +	 * Debugging requires use of the padding between object
> +	 * and whatever may come after it.
> +	 */
> +	if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
> +		return s->object_size;
> +#endif
> +	/*
> +	 * If we have the need to store the freelist pointer
> +	 * back there or track user information then we can
> +	 * only use the space before that information.
> +	 */
> +	if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER))
> +		return s->inuse;
> +	/*
> +	 * Else we can use all the padding etc for the allocation
> +	 */
> +	return s->size;
> +}
> +#else /* !CONFIG_SLUB */

Abnd drop the else branch?

> +static inline size_t slab_ksize(const struct kmem_cache *s)
> +{
> +	return s->object_size;
> +}
> +#endif

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