Re: [PATCH v14 01/12] splice: Fix O_DIRECT file read splice to avoid reversion of ITER_PIPE

[Christoph Hellwig]

> +	if (!bv)
> +		return -ENOMEM;
> +
> +	pages = (void *)(bv + npages);

I think this cast should be to struct page **… not void *.

> +	npages = alloc_pages_bulk_array(GFP_USER, npages, pages);
> +	if (!npages) {
> +		kfree(bv);
> +		return -ENOMEM;
> +	}

> +	reclaim = npages * PAGE_SIZE;
> +	remain = 0;
> +	if (ret > 0) {
> +		reclaim -= ret;
> +		remain = ret;

...

> +	/* Free any pages that didn't get touched at all. */
> +	reclaim /= PAGE_SIZE;

Any reason not to keep reclaim in PAGE_SIZE units to start with?