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

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Message-Id: <9C76D5F2-5D3C-4499-B358-129428FA6F33@kernel.crashing.org>
Date:	Tue, 7 Apr 2009 10:32:20 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	beckyb@...nel.crashing.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, jeremy@...p.org, ian.campbell@...rix.com
Subject: Re: [PATCH 5/7] swiotlb: (re)Create swiotlb_unmap_single


On Apr 7, 2009, at 4:09 AM, FUJITA Tomonori wrote:

> On Tue, 7 Apr 2009 01:34:44 -0500
> Kumar Gala <galak@...nel.crashing.org> wrote:
>
>>
>> On Apr 6, 2009, at 9:24 PM, FUJITA Tomonori wrote:
>>
>>> 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.
>>
>> What do you suggest we call it?  __swiotlb_unmap_single.
>
> I think that __swiotlb_unmap_single is better because the name implies
> that it's an internal function. It's fine by me.
>
> If it is odd that __swiotlb_unmap_single() is just a wrapper function
> of unmap_single(), which does the real job to unmap a dma mapping, it
> might be another possible option to rename unmap_single to
> do_unamp_single and use unmap_single.

I think you lost me here.  I'd prefer to just use  
__swiotlb_unmap_single at this point and get this code into the tree  
and work on such renaming after the fact (if that's ok).

- k
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