linux-kernel - Re: [PATCH] remove DMA_nBIT

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Message-Id: <20090506223452.65e545d8.akpm@linux-foundation.org>
Date:	Wed, 6 May 2009 22:34:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	yanghy@...fujitsu.com, 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

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?
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