linux-kernel - Re: [PATCH 5/7] swiotlb: (re)Create swiotlb_unmap

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Date:	Tue, 7 Apr 2009 11:24:39 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	beckyb@...nel.crashing.org
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, jeremy@...p.org,
	fujita.tomonori@....ntt.co.jp, ian.campbell@...rix.com
Subject: Re: [PATCH 5/7] swiotlb: (re)Create swiotlb_unmap_single

On Fri,  3 Apr 2009 20:56:47 -0500
Becky Bruce <beckyb@...nel.crashing.org> wrote:

> This mirrors the current swiotlb_sync_single() setup
> where the swiotlb_unmap_single() function is static to this
> file and contains the logic required to determine if we need
> to call actual sync_single.  Previously, swiotlb_unmap_page
> and swiotlb_unmap_sg were duplicating very similar code.
> The duplicated code has also been reformatted for
> readability.
> 
> Note that the swiotlb_unmap_sg code was previously doing
> a complicated comparison to determine if an addresses needed
> to be unmapped where a simple is_swiotlb_buffer() call
> would have sufficed.
> 
> Signed-off-by: Becky Bruce <beckyb@...nel.crashing.org>
> ---
>  lib/swiotlb.c |   36 +++++++++++++++++++++++-------------
>  1 files changed, 23 insertions(+), 13 deletions(-)
> 
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index af2ec25..602315b 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c

I don't think 'swiotlb_unmap_single' name is appropriate.

swiotlb_unmap_single sounds like an exported function that IOMMUs can
use (and it was) however it should not be.
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