linux-kernel - Re: [PATCH .36-rc8] arm: mm: allow, but warn, when issuing ioremap() on RAM

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Message-ID: <AANLkTinjd6_X62XPAvHNK4Tf233yD0-LKBBe96CE8_T2@mail.gmail.com>
Date:	Fri, 15 Oct 2010 17:25:07 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	linux-main <linux-kernel@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Woodruff <r-woodruff2@...com>,
	Felipe Contreras <felipe.contreras@...il.com>
Subject: Re: [PATCH .36-rc8] arm: mm: allow, but warn, when issuing ioremap()
 on RAM

On Fri, Oct 15, 2010 at 5:15 PM, Felipe Contreras
<felipe.contreras@...il.com> wrote:
> From: Catalin Marinas <catalin.marinas@....com>
>
> Drivers have been relying on this behavior, but done so wrongly.
> However, rather than breaking drivers from .35 to .36, we should warn on
> .36 and only break on .37. This way we give a chance for contributors to
> fix the issues.
>
> According to ARM, the behavior of having multiple mappings is
> unspecified from ARMv6+. This causes real issues specially on modern
> hardware, and specially with speculative prefetching. So drivers need to
> be fixed.
>
> Also, since current hardware has palliative meassures to deal with
> multiple mappings with the same memory type but diferent cacheability
> attributes, ensure that such restriction is taking place.

Ah, disregard this, a similar one is on .36-rc8 already (06c1088), I
wasn't CC'ed.

-- 
Felipe Contreras
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