Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
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- To: Ryan Mallon <rmallon@xxxxxxxxx>
- Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
- From: Matthew Wilcox <matthew@xxxxxx>
- Date: Sun, 19 Jun 2011 18:42:52 -0600
- Cc: Ingo Molnar <mingo@xxxxxxx>, Petr Tesarik <ptesarik@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, "H. Peter Anvin" <hpa@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: <4DFE7FF9.9070406@gmail.com>
- List-id: <linux-ia64.vger.kernel.org>
- References: <201106171038.25988.ptesarik@suse.cz> <20110617093032.GA19235@elte.hu> <4DFE7FF9.9070406@gmail.com>
- User-agent: Mutt/1.5.18 (2008-05-17)
On Mon, Jun 20, 2011 at 09:02:17AM +1000, Ryan Mallon wrote:
> There are drivers where this makes sense. For example an FPGA device
> with a proprietary register layout on the memory bus can be done this
> way. The FPGA can simply be mapped in user-space via /dev/mem and
> handled there. If the device requires no access other than memory bus
> reads and writes then writing a custom char device driver just to get an
> mmap function seems a bit overkill.
Calling a 30 line device driver "overkill" might in itself be overkill?
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
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