linux-kernel - Re: [PATCH] asm-generic: dma: Add BUG_ON for uninitialized dma

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Message-Id: <20100122101039D.fujita.tomonori@lab.ntt.co.jp>
Date:	Fri, 22 Jan 2010 10:11:25 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	monstr@...str.eu
Cc:	linux-kernel@...r.kernel.org, michal.simek@...alogix.com,
	arnd@...db.de, linux-arch@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp, akpm@...ux-foundation.org,
	mingo@...e.hu, joerg.roedel@....com
Subject: Re: [PATCH] asm-generic: dma: Add BUG_ON for uninitialized dma_ops

On Wed, 20 Jan 2010 11:08:31 +0100
monstr@...str.eu wrote:

> From: Michal Simek <monstr@...str.eu>
> 
> Check that dma_ops are initialized correctly. Without this
> checking you get kernel fault and you don't know where the problem is.

Hmm, dma_ops is initialized in early architecture-specific boot-up
code. We don't change it often. I don't think that we need much time
to find where problems are.

The benefit is insufficient to justify the overhead.
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