linux-kernel - Re: [PATCH 1/2] x86: Optimize resource lookups for ioremap

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Date:	Wed, 27 Aug 2014 17:21:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mike Travis <travis@....com>
Cc:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	msalter@...hat.com, dyoung@...hat.com, riel@...hat.com,
	peterz@...radead.org, mgorman@...e.de,
	linux-kernel@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
	Alex Thorlton <athorlton@....com>
Subject: Re: [PATCH 1/2] x86: Optimize resource lookups for ioremap

On Wed, 27 Aug 2014 16:54:18 -0700 Mike Travis <travis@....com> wrote:

> > If we're still at 1+ hours then little bodges like this are nowhere
> > near sufficient and sterner stuff will be needed.
> > 
> > Do we actually need the test?  My googling turns up zero instances of
> > anyone reporting the "ioremap on RAM pfn" warning.
> 
> We get them more than we like, mostly from 3rd party vendors, and
> esp. those that merely port their windows drivers to linux.

Dang.  So wrapping the check in CONFIG_DEBUG_VM would be problematic?
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