From: Ryan Mallon <rmallon@gmail.com>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Ingo Molnar <mingo@elte.hu>, Petr Tesarik <ptesarik@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
Fenghua Yu <fenghua.yu@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
Paul Mundt <lethal@linux-sh.org>,
Russell King <linux@arm.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Tony Luck <tony.luck@intel.com>,
x86@kernel.org, linux-arm-kernel@lists.infradead.org,
linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
linux-kernel@vger.kernel.org,
Arjan van de Ven <arjan@infradead.org>,
Dave Jones <davej@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
Date: Mon, 20 Jun 2011 10:46:08 +1000 [thread overview]
Message-ID: <4DFE9850.7030400@gmail.com> (raw)
In-Reply-To: <20110620004252.GE19693@parisc-linux.org>
On 20/06/11 10:42, Matthew Wilcox wrote:
> 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?
>
I mean overkill in the sense of having to write the driver at all. Why
write a 30 line driver just to re-implement some functionality of /dev/mem?
~Ryan
next prev parent reply other threads:[~2011-06-20 0:46 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-17 8:38 [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-06-17 8:43 ` [PATCH 01/10] Return EOF on out-of-bounds read from /dev/mem Petr Tesarik
2011-06-17 8:44 ` [PATCH 02/10] (un)xlate_dev_mem_ptr: use phys_addr_t for the @phys parameter Petr Tesarik
2011-06-17 8:45 ` [PATCH 03/10] x86: translate highmem /dev/mem pointers Petr Tesarik
2011-06-17 8:45 ` [PATCH 04/10] ia64: change xlate_dev_mem_ptr's argument to phys_addr_t Petr Tesarik
2011-06-17 8:45 ` [PATCH 05/10] valid_phys_addr_range: use phys_addr_t for the @addr parameter Petr Tesarik
2011-06-17 8:46 ` [PATCH 06/10] sh: change valid_phys_addr_range's @addr param to phys_addr_t Petr Tesarik
2011-06-17 8:46 ` [PATCH 07/10] arm: " Petr Tesarik
2011-06-17 8:47 ` [PATCH 08/10] ia64: " Petr Tesarik
2011-06-17 8:48 ` [PATCH 09/10] x86: provide arch-specific valid_phys_addr_range() Petr Tesarik
2011-06-17 8:48 ` [PATCH 10/10] Allow reading/writing all memory through /dev/mem Petr Tesarik
2011-06-17 9:30 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Ingo Molnar
2011-06-17 9:41 ` Russell King - ARM Linux
2011-06-17 9:55 ` Petr Tesarik
2011-06-20 2:42 ` Américo Wang
2011-06-27 7:46 ` Petr Tesarik
2011-06-19 23:02 ` Ryan Mallon
2011-06-19 23:44 ` H. Peter Anvin
2011-06-20 7:41 ` Ingo Molnar
2011-06-20 15:59 ` H. Peter Anvin
2011-06-20 16:40 ` Ingo Molnar
2011-06-20 16:44 ` H. Peter Anvin
2011-06-21 6:55 ` Srivatsa Vaddagiri
2011-06-20 0:42 ` Matthew Wilcox
2011-06-20 0:46 ` Ryan Mallon [this message]
2011-06-20 0:52 ` Matthew Wilcox
2011-06-20 1:02 ` Ryan Mallon
2011-06-20 7:31 ` Ingo Molnar
2011-06-20 8:03 ` Ryan Mallon
2011-06-20 17:10 ` Ray Lee
2011-06-29 9:05 ` Petr Tesarik
2011-07-01 12:58 ` Ingo Molnar
2011-07-01 13:43 ` Petr Tesarik
2011-07-01 13:47 ` Christoph Hellwig
2011-07-01 14:37 ` Ingo Molnar
2011-07-01 14:41 ` Christoph Hellwig
2011-07-01 14:46 ` Ingo Molnar
2011-07-01 14:54 ` Petr Tesarik
2011-07-01 15:36 ` Ingo Molnar
2011-07-01 16:00 ` H. Peter Anvin
2011-07-01 16:13 ` Ingo Molnar
2011-07-01 19:34 ` Petr Tesarik
2011-07-01 19:56 ` Ingo Molnar
2011-07-01 20:44 ` Petr Tesarik
2011-07-03 19:46 ` Ingo Molnar
2011-07-05 17:49 ` Matthew Garrett
2011-07-05 17:56 ` H. Peter Anvin
2011-07-05 22:34 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2011-06-20 13:24 Dave Anderson
2011-06-21 2:52 ` Cong Wang
2011-06-21 13:03 ` Dave Anderson
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