From: Christoph Hellwig <hch@infradead.org>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary
Date: Fri, 01 Jul 2011 13:47:05 +0000 [thread overview]
Message-ID: <20110701134705.GA6175@infradead.org> (raw)
In-Reply-To: <20110701125802.GE12605@elte.hu>
On Fri, Jul 01, 2011 at 02:58:02PM +0200, Ingo Molnar wrote:
> So what was not mentioned in your series, what is *your* motivation
> and your usecase? Enabling closed-source userspace drivers? Enabling
> the crash utility?
He stated it pretty clearly in the thread, it's the crash utility.
>
> If the former then shame on you, if the latter then how do you
> explain that distros appear to disable the RAM aspect of /dev/mem:
>
> $ grep DEVMEM $(rpm -ql kernel-2.6.38-0.rc7.git2.3.fc16.x86_64 | grep config-2.6 )
> CONFIG_STRICT_DEVMEM=y
>
> So the crash utility use-case does not work on unpatched, default
> kernels, right?
Not if you have highmem. That's why Redhat or Fedora to quote your
example patch in the /dev/crash driver, which totally defeats the
CONFIG_STRICT_DEVMEM setting. But apparently it's good enough that no
one either noticed or at least doesn't care.
next prev parent reply other threads:[~2011-07-01 13:47 UTC|newest]
Thread overview: 40+ 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 8:45 ` [PATCH 04/10] ia64: change xlate_dev_mem_ptr's argument to phys_addr_t Petr Tesarik
2011-06-17 8:47 ` [PATCH 08/10] ia64: change valid_phys_addr_range's @addr param " Petr Tesarik
2011-06-17 9:30 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-06-17 9:41 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Russell King - ARM Linux
2011-06-17 9:55 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-06-20 2:42 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Américo Wang
2011-06-27 7:46 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Petr Tesarik
2011-06-19 23:02 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary 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 6:56 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Srivatsa Vaddagiri
2011-06-20 0:42 ` Matthew Wilcox
2011-06-20 0:46 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ryan Mallon
2011-06-20 0:52 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Matthew Wilcox
2011-06-20 1:02 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary 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 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 12:58 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-01 13:43 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 13:47 ` Christoph Hellwig [this message]
2011-07-01 14:37 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-01 14:41 ` Christoph Hellwig
2011-07-01 14:46 ` Ingo Molnar
2011-07-01 14:54 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 15:36 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-01 16:00 ` H. Peter Anvin
2011-07-01 16:13 ` Ingo Molnar
2011-07-01 19:34 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-01 19:56 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-01 20:44 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-07-03 19:46 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary Ingo Molnar
2011-07-05 17:49 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of Matthew Garrett
2011-07-05 17:56 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary H. Peter Anvin
2011-07-05 22:34 ` H. Peter Anvin
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