From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: Android and compatibility with deprecated armv7 instructions
Date: Wed, 2 Jul 2014 18:01:41 +0100 [thread overview]
Message-ID: <20140702170141.GH24879@arm.com> (raw)
In-Reply-To: <20140702163923.GJ410@sirena.org.uk>
On Wed, Jul 02, 2014 at 05:39:23PM +0100, Mark Brown wrote:
> On Wed, Jul 02, 2014 at 11:01:33AM +0100, Will Deacon wrote:
>
> > (1) The hardware doesn't have the instruction at all. If we start
> > emulating it, then we'll always have to emulate it and it doesn't
> > encourage software migration.
>
> That's what the logging other architectures did in similar situations
> was intended to help address - even if people don't care about the
> performance impact having loud complaints in the logs tends to cause
> some useful subset of users to report it as a problem.
I don't think logging something to dmesg is going to make a blind bit of
difference on an Android device. Maybe we could get SWP emulation to request
access to the users contacts and send everybody a text message each time
they issue the instruction?
Seriously though, nothing causes loud complaints like a SIGILL. This thread
is evidence of that.
Will
next prev parent reply other threads:[~2014-07-02 17:01 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-01 23:06 Android and compatibility with deprecated armv7 instructions Colin Cross
2014-07-01 23:42 ` Olof Johansson
2014-07-01 23:48 ` Mark Brown
2014-07-02 10:01 ` Will Deacon
2014-07-02 15:48 ` Colin Cross
2014-07-02 16:16 ` Will Deacon
2014-07-02 18:03 ` Christopher Covington
2014-07-02 18:25 ` Will Deacon
2014-07-02 19:47 ` Mark Brown
2014-07-05 21:26 ` Rob Herring
2014-07-02 16:39 ` Mark Brown
2014-07-02 17:01 ` Will Deacon [this message]
2014-07-02 17:33 ` Mark Brown
2014-07-02 22:14 ` Grant Likely
2014-07-03 10:41 ` Catalin Marinas
2014-07-03 14:28 ` Arnd Bergmann
2014-07-03 15:00 ` Russell King - ARM Linux
2014-07-03 15:40 ` Grant Likely
2014-07-03 17:13 ` Catalin Marinas
2014-07-03 17:48 ` Russell King - ARM Linux
2014-07-03 18:15 ` Arnd Bergmann
2014-07-03 18:30 ` Russell King - ARM Linux
2014-07-03 18:37 ` Will Deacon
2014-07-03 18:52 ` Russell King - ARM Linux
2014-07-03 19:00 ` Will Deacon
2014-07-04 8:57 ` Catalin Marinas
2014-07-04 9:25 ` Russell King - ARM Linux
2014-07-04 10:12 ` Arnd Bergmann
2014-07-04 14:09 ` Dr. David Alan Gilbert
2014-07-04 12:56 ` Grant Likely
2014-07-04 13:31 ` Russell King - ARM Linux
2014-07-03 18:46 ` Will Deacon
2014-07-03 18:53 ` Arnd Bergmann
2014-07-03 19:07 ` Russell King - ARM Linux
2014-07-03 19:40 ` Arnd Bergmann
2014-07-04 13:25 ` Grant Likely
2014-07-03 16:22 ` Grant Likely
2014-07-03 17:05 ` Russell King - ARM Linux
2014-07-03 17:32 ` Will Deacon
2014-07-03 18:23 ` Arnd Bergmann
2014-07-03 18:38 ` Peter Maydell
2014-07-03 18:40 ` Will Deacon
2014-07-03 18:32 ` Mark Brown
2014-07-03 22:16 ` Måns Rullgård
2014-07-03 22:47 ` Russell King - ARM Linux
2014-07-04 7:08 ` Ard Biesheuvel
2014-07-04 8:24 ` Catalin Marinas
2014-07-04 8:33 ` Ard Biesheuvel
2014-07-04 9:21 ` Måns Rullgård
2014-07-04 9:34 ` Russell King - ARM Linux
2014-07-04 10:21 ` Måns Rullgård
2014-07-04 10:33 ` Russell King - ARM Linux
2014-07-04 11:00 ` Ard Biesheuvel
2014-07-04 17:28 ` Nicolas Pitre
2014-07-03 17:43 ` Catalin Marinas
2014-07-04 13:22 ` Grant Likely
2014-07-04 19:24 ` Mark Brown
2014-07-04 19:33 ` Arnd Bergmann
2014-07-04 22:06 ` Måns Rullgård
2014-07-04 22:08 ` Mark Brown
2014-07-05 11:14 ` Catalin Marinas
2014-07-05 11:25 ` Russell King - ARM Linux
2014-07-05 16:43 ` Mark Brown
2014-07-05 17:06 ` Catalin Marinas
2014-07-05 18:43 ` Arnd Bergmann
2014-07-05 21:19 ` Catalin Marinas
2014-07-06 15:39 ` Arnd Bergmann
2014-07-07 13:59 ` Janne Grunau
2014-07-07 14:52 ` Catalin Marinas
2014-07-07 17:52 ` Janne Grunau
2014-07-07 15:43 ` Peter Maydell
2014-07-08 5:28 ` Måns Rullgård
2014-07-07 14:35 ` Catalin Marinas
2014-07-07 21:26 ` Arnd Bergmann
2014-07-07 12:28 ` Grant Likely
2014-07-07 18:35 ` Colin Cross
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