linux-kernel - Re: [patch] x86: allow ZONE

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Message-ID: <alpine.DEB.2.00.1010141507060.3696@chino.kir.corp.google.com>
Date:	Thu, 14 Oct 2010 15:08:03 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Casey Dahlin <cdahlin@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] x86: allow ZONE_DMA to be configurable

On Thu, 14 Oct 2010, H. Peter Anvin wrote:

> > I'm not running a CONFIG_EMBEDDED kernel and I'm pretty sure Casey isn't 
> > either, so we'd still need to carry our own patches to change the Kconfig 
> > bool line anyway.
> > 
> > I'm suprised that we can't allow users who definitively know that they 
> > have no hardware limitations the ability to disable ZONE_DMA.  Would a 
> > strong caution in the Kconfig "help" text suffice or will you not be 
> > convinced?
> 
> CONFIG_EMBEDDED *is* "I am a user who (think I) know what I'm doing".
> That is *what it is* and *all it is*.
> 

Ok, I'll follow Ingo's suggestion of renaming this to CONFIG_EXPERT and 
then prepare a patchset that allows users to disable CONFIG_ZONE_DMA, 
CONFIG_GENERIC_ISA_DMA, and CONFIG_ISA_DMA_API on x86.

Thanks!
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