linux-kernel - Re: [PATCH 04 of 38] swiotlb: move some definitions to header

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Date:	Mon, 17 Nov 2008 12:48:51 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	jeremy@...p.org
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, x86@...nel.org,
	ian.campbell@...rix.com
Subject: Re: [PATCH 04 of 38] swiotlb: move some definitions to header

On Thu, 13 Nov 2008 11:10:02 -0800
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> From: Ian Campbell <ian.campbell@...rix.com>
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> ---
>  include/linux/swiotlb.h |   14 ++++++++++++++
>  lib/swiotlb.c           |   14 +-------------
>  2 files changed, 15 insertions(+), 13 deletions(-)
> 
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -7,6 +7,20 @@
>  struct dma_attrs;
>  struct scatterlist;
>  
> +/*
> + * Maximum allowable number of contiguous slabs to map,
> + * must be a power of 2.  What is the appropriate value ?
> + * The complexity of {map,unmap}_single is linearly dependent on this value.
> + */
> +#define IO_TLB_SEGSIZE	128
> +
> +
> +/*
> + * log of the size of each IO TLB slab.  The number of slabs is command line
> + * controllable.
> + */
> +#define IO_TLB_SHIFT 11
> +

Why do we need to export IO_TLB_SEGSIZE and IO_TLB_SHIFT to everyone
in include/linux?
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