linux-kernel - Re: [PATCH V4 1/3] x86: introduce CONFIG_X86_DEV_DMA

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Message-ID: <4F87186B.9010303@zytor.com>
Date:	Thu, 12 Apr 2012 11:01:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	x86@...nel.org, Giancarlo Asnaghi <giancarlo.asnaghi@...com>,
	Alan Cox <alan@...ux.intel.com>,
	Alessandro Rubini <rubini@...dd.com>
Subject: Re: [PATCH V4 1/3] x86: introduce CONFIG_X86_DEV_DMA_OPS

On 03/13/2012 11:56 PM, Ingo Molnar wrote:
> 
> * Alessandro Rubini <rubini@...dd.com> wrote:
> 
>> 32-bit x86 systems may need their own DMA operations, so add a 
>> new config option, which is turned on for 64-bit systems. This 
>> patch has no functional effect but it paves the way for 
>> supporting the STA2x11 I/O Hub and possibly other chips.
>>
>> Signed-off-by: Alessandro Rubini <rubini@...dd.com>
>> Acked-by: Giancarlo Asnaghi <giancarlo.asnaghi@...com>
>> Cc: Alan Cox <alan@...ux.intel.com>
>> ---
>>  arch/x86/Kconfig                   |    5 +++++
>>  arch/x86/include/asm/device.h      |    4 ++--
>>  arch/x86/include/asm/dma-mapping.h |    2 +-
>>  3 files changed, 8 insertions(+), 3 deletions(-)
> 
> Ok, the whole series looks pretty clean, modulo a few mostly 
> cosmetic details in the driver itself.
> 
> Andrew, you are typically merging dma-mapping.h patches, would 
> you like to do these, or can we do it in tip:x86/platform?
> 
> It would also be nice if the gents on Cc: would voice objections 
> or approval, if any.
> 

I looked over it, and at least this bit seems okay to me.

Acked-by: H. Peter Anvin <hpa@...or.com>

Andrew, I guess the question is still open?

I have to express some concern about where this device may be going, though.

	-hpa
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