Re: [PATCH] xfs: allocate sector sized IO buffer via page_frag_alloc

Christoph Hellwig
2019-03-08T08:18:14Z

On Wed, Feb 27, 2019 at 08:07:31AM +0100, Vlastimil Babka wrote:
> > I don't know _what_ Ming Lei is saying. I thought the problem was
> > with slab redzones, which need to be before and after each object,
> > but apparently the problem is with KASAN as well.
>
> That's what I thought as well. But if we can solve it for caches created
> by kmem_cache_create(..., align, ...) then IMHO we could guarantee
> natural alignment for power-of-two kmalloc caches as well.

Yes, having a version of kmalloc that guarantees power of two alignment
would be extremely helpful and avoid a lot of pointless boilerplate code.