Re: [patch] rd: support XIP

[Andrew Morton]

On Tue, 4 Dec 2007 12:21:00 +0100 Nick Piggin <npiggin@xxxxxxx> wrote:

> +	 *
> +	 * Cannot support XIP and highmem, because our ->direct_access
> +	 * routine for XIP must return memory that is always addressable.
> +	 * If XIP was reworked to use pfns and kmap throughout, this
> +	 * restriction might be able to be lifted.
>  	 */
> +	gfp_flags = GFP_NOIO | __GFP_ZERO;
> +#ifndef CONFIG_BLK_DEV_XIP
> +	gfp_flags |= __GFP_HIGHMEM;
> +#endif

A dubious tradeoff?
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