From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Nicolas Pitre <nico@fluxnic.net>,
microblaze-uclinux@itee.uq.edu.au,
devicetree-discuss <devicetree-discuss@lists.ozlabs.org>,
Olof Johansson <olof@lixom.net>,
linuxppc-dev <linuxppc-dev@ozlabs.org>,
Mitch Bradley <wmb@firmworks.com>,
Dan Malek <ppc6dev@digitaldans.com>,
Jeremy Kerr <jeremy.kerr@canonical.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: Request review of device tree documentation
Date: Mon, 14 Jun 2010 10:47:40 +0100 [thread overview]
Message-ID: <20100614094740.GB7881@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1276508170.2552.43.camel@pasglop>
On Mon, Jun 14, 2010 at 07:36:10PM +1000, Benjamin Herrenschmidt wrote:
> However, there's a lot of room for abuse here and I'm worried that if it
> becomes widespread, we'll start seeing vendors use that as a way to do
> some kind of HAL and hide various platform methods in there (clock
> control, nvram, etc...).
This is what I'm worried about too.
As I said in my first reply in this thread, calling out from the kernel
will kill performance due to the time taken to shut down the caches and
MMU, which can only be done safely with all exceptions turned off.
The only time that it can be seriously considered is if you're calling
out to reboot, shutdown or kexec.
next prev parent reply other threads:[~2010-06-14 9:47 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-11 22:59 Request review of device tree documentation Grant Likely
2010-06-11 23:47 ` Dan Malek
2010-06-12 2:58 ` Benjamin Herrenschmidt
2010-06-12 4:48 ` Mitch Bradley
2010-06-12 6:53 ` Grant Likely
2010-06-12 8:19 ` Mitch Bradley
2010-06-12 10:45 ` Benjamin Herrenschmidt
2010-06-12 10:48 ` Benjamin Herrenschmidt
2010-06-12 16:30 ` Mitch Bradley
2010-06-12 22:52 ` Benjamin Herrenschmidt
2010-06-13 5:07 ` Grant Likely
2010-06-13 5:39 ` Mitch Bradley
2010-06-13 5:59 ` Benjamin Herrenschmidt
2010-06-13 6:45 ` Mitch Bradley
2010-06-13 8:29 ` Benjamin Herrenschmidt
2010-06-14 5:36 ` Grant Likely
2010-06-14 20:00 ` Ben Dooks
2010-06-13 8:57 ` Benjamin Herrenschmidt
2010-06-14 5:23 ` Grant Likely
2010-06-14 7:38 ` Russell King - ARM Linux
2010-06-14 7:45 ` Mitch Bradley
2010-06-14 9:25 ` Russell King - ARM Linux
2010-06-14 9:36 ` Benjamin Herrenschmidt
2010-06-14 9:47 ` Russell King - ARM Linux [this message]
2010-06-14 14:29 ` Jamie Lokier
2010-06-14 13:51 ` Nicolas Pitre
2010-06-14 15:35 ` Grant Likely
2010-06-14 15:58 ` Nicolas Pitre
2010-06-14 16:16 ` Grant Likely
2010-06-14 5:02 ` Grant Likely
2010-06-14 12:44 ` David Gibson
2010-06-14 14:59 ` Nicolas Pitre
2010-06-14 15:08 ` Grant Likely
2010-06-14 16:02 ` Jamie Lokier
2010-06-14 16:23 ` Nicolas Pitre
2010-06-14 16:29 ` Grant Likely
2010-06-14 16:28 ` Grant Likely
2010-06-14 16:33 ` Jamie Lokier
2010-06-14 16:58 ` Mitch Bradley
2010-06-14 17:26 ` Nicolas Pitre
2010-06-14 18:20 ` Mitch Bradley
2010-06-14 19:40 ` Nicolas Pitre
2010-06-14 20:08 ` Mark Brown
2010-06-16 6:09 ` Mike Rapoport
2010-06-16 6:13 ` Mitch Bradley
2010-06-16 6:17 ` Mike Rapoport
2010-06-16 6:32 ` Mitch Bradley
2010-06-16 6:47 ` Mike Rapoport
2010-06-16 7:40 ` Mitch Bradley
2010-06-16 9:45 ` Vladimir Pantelic
2010-06-16 10:39 ` Mike Rapoport
2010-06-16 11:41 ` Jamie Lokier
2010-06-16 13:48 ` Jamie Bennett
2010-06-16 14:39 ` Nicolas Pitre
2010-06-16 17:43 ` Tim Bird
2010-06-16 6:52 ` M. Warner Losh
2010-06-18 22:12 ` Frank Rowand
2010-06-15 2:02 ` David Gibson
2010-06-14 15:51 ` M. Warner Losh
2010-06-13 5:48 ` Benjamin Herrenschmidt
2010-06-14 5:13 ` Grant Likely
2010-06-14 6:09 ` Benjamin Herrenschmidt
2010-06-14 6:17 ` Mitch Bradley
2010-06-12 22:15 ` Olof Johansson
2010-06-12 23:09 ` Grant Likely
2010-06-13 6:47 ` [microblaze-uclinux] " Edgar E. Iglesias
2010-06-12 3:00 ` Benjamin Herrenschmidt
2010-06-12 3:07 ` Benjamin Herrenschmidt
2010-06-13 13:12 ` Jeremy Kerr
2010-06-14 5:40 ` Grant Likely
2010-06-12 17:33 ` Stephan Gatzka
2010-06-12 18:19 ` Grant Likely
2010-06-14 5:54 ` Grant Likely
2010-08-05 4:43 ` David Gibson
2010-09-01 16:19 ` Grant Likely
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