Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
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- To: Ingo Molnar <mingo@xxxxxxx>
- Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Mon, 20 Jun 2011 09:44:25 -0700
- Cc: Ryan Mallon <rmallon@xxxxxxxxx>, Petr Tesarik <ptesarik@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Paul Mundt <lethal@xxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Arjan van de Ven <arjan@xxxxxxxxxxxxx>, Dave Jones <davej@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- In-reply-to: <20110620164045.GB10815@elte.hu>
- List-id: <linux-ia64.vger.kernel.org>
- References: <201106171038.25988.ptesarik@suse.cz> <20110617093032.GA19235@elte.hu> <4DFE7FF9.9070406@gmail.com> <4DFE89E0.5020509@zytor.com> <20110620074124.GB24716@elte.hu> <4DFF6E58.8090306@zytor.com> <20110620164045.GB10815@elte.hu>
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On 06/20/2011 09:40 AM, Ingo Molnar wrote:
>
> There is no reason why they couldnt use a .config option or a boot
> option to get their weird stuff going, which weird stuff also happens
> to be useful.
>
> What i'm somewhat against is having this enabled by default for weird
> stuff that also happens to be harmful - and the fact that it never
> worked over 4G physical gives us the perfect opportunity to do just
> that.
>
I'm concerned about that notion. I think it's fine to modularize
/dev/mem, but what we're seeing is that Red Hat and all kinds of other
entities are putting in ad hoc versions of /dev/mem, but of course doing
so incorrectly.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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