linux-kernel - Re: [patch] rd: support XIP

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Message-Id: <20071204032620.aaee039b.akpm@linux-foundation.org>
Date:	Tue, 4 Dec 2007 03:26:20 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>, rob@...dley.net,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [patch] rd: support XIP

On Tue, 4 Dec 2007 12:21:00 +0100 Nick Piggin <npiggin@...e.de> 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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