netdev - Re: [PATCH] remove DMA_nBIT

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Message-ID: <4A029BE1.4090309@cn.fujitsu.com>
Date:	Thu, 07 May 2009 16:29:21 +0800
From:	Yang Hongyang <yanghy@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.arm.linux.org.uk
Subject: Re: [PATCH] remove DMA_nBIT_MASK macro

Andrew Morton wrote:
> On Thu, 7 May 2009 14:14:16 +0900 FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
>> We replaced all DMA_nBIT_MASK macros with DMA_BIT_MASK(n) but why do
>> we still keep DMA_nBIT_MASK macros in include/linux/dma-mapping.h?
>>
>> As long as these macros exist, people use them. The current git has
>> two users and linux-next have other users.
>>
>> Is it better to remove DMA_nBIT_MASK macros completely now?
> 
> Yes, the plan is to remove them.
> 
> Doing so will break lots and lots of out-of-tree drivers, causing
> people some grief.  Is there any way in which we can cause their use to
> cause __deprecated warnings for a couple of months, to give people a
> chance to migrate?
> 
> 

Shall we use something like below to warn people?
#define DMA_64BIT_MASK	DMA_BIT_MASK(64);(__deprecated warnings:use DMA_BIT_MASK(64) instead) ?

-- 
Regards
Yang Hongyang
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