linux-kernel - Re: [PATCH v2 0/8] sparc: use asm-generic/dma-mapping-common.h and pci-dma-compat.h

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Message-ID: <20090803055608.GB19428@elte.hu>
Date:	Mon, 3 Aug 2009 07:56:08 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	joerg.roedel@....com, fujita.tomonori@....ntt.co.jp,
	reif@...thlink.net, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, tony.luck@...el.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH v2 0/8] sparc: use asm-generic/dma-mapping-common.h and
	pci-dma-compat.h


* David Miller <davem@...emloft.net> wrote:

> From: Joerg Roedel <joerg.roedel@....com>
> Date: Tue, 21 Jul 2009 18:05:38 +0200
> 
> > Hmm these checks sound specific and hard to maintain. I think 
> > its best to give architectures the option whether to enable this 
> > check or not.
> 
> No matter how the arch works in this area, there should be some 
> kind of sanity check.
> 
> So, it probably makes sense to allow an arch to override the 
> validation function rather than turn the test completely off.

I'm wondering how sparc32 handles core_kernel_text() & friends? 

Those functions already assume that the bits between _stext and 
_etext are all core kernel text and not generic pages freed back to 
the buddy.

	Ingo
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