From: Arnd Bergmann <arnd@arndb.de>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Rob Clark <rob.clark@linaro.org>,
linux-arm-kernel@lists.infradead.org, patches@linaro.org,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
dri-devel@lists.freedesktop.org
Subject: Re: [PATCH] ARM: add get_user() support for 8 byte types
Date: Thu, 15 Nov 2012 09:19:37 +0000 [thread overview]
Message-ID: <201211150919.37343.arnd@arndb.de> (raw)
In-Reply-To: <20121113112430.GF28341@n2100.arm.linux.org.uk>
On Tuesday 13 November 2012, Russell King - ARM Linux wrote:
> You're missing something; that is one of the greatest powers of open
> source. The many eyes (and minds) effect. Someone out there probably
> has a solution to whatever problem, the trick is to find that person. :)
>
> I think we have a working solution for this for ARM. It won't be suitable
> for every arch, where they have 8-bit and 16-bit registers able to be
> allocated by the compiler, but for architectures where the minimum register
> size is 32-bit, what we have below should work.
I don't mind at all adding the extension to ARM, and I think it's pretty
cool that you guys actually found a working solution.
The part that worries me is that we are making architecture independent
code depend on a clever hack that may or may not be possible to implement
on a given architecture, and that most architecture maintainers wouldn't
know how to implement correctly even if it's possible.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: add get_user() support for 8 byte types
Date: Thu, 15 Nov 2012 09:19:37 +0000 [thread overview]
Message-ID: <201211150919.37343.arnd@arndb.de> (raw)
In-Reply-To: <20121113112430.GF28341@n2100.arm.linux.org.uk>
On Tuesday 13 November 2012, Russell King - ARM Linux wrote:
> You're missing something; that is one of the greatest powers of open
> source. The many eyes (and minds) effect. Someone out there probably
> has a solution to whatever problem, the trick is to find that person. :)
>
> I think we have a working solution for this for ARM. It won't be suitable
> for every arch, where they have 8-bit and 16-bit registers able to be
> allocated by the compiler, but for architectures where the minimum register
> size is 32-bit, what we have below should work.
I don't mind at all adding the extension to ARM, and I think it's pretty
cool that you guys actually found a working solution.
The part that worries me is that we are making architecture independent
code depend on a clever hack that may or may not be possible to implement
on a given architecture, and that most architecture maintainers wouldn't
know how to implement correctly even if it's possible.
Arnd
next prev parent reply other threads:[~2012-11-15 9:19 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-09 21:17 [PATCH] ARM: add get_user() support for 8 byte types Rob Clark
2012-11-09 21:17 ` Rob Clark
2012-11-12 10:46 ` Will Deacon
2012-11-12 10:46 ` Will Deacon
2012-11-12 13:46 ` Rob Clark
2012-11-12 13:46 ` Rob Clark
2012-11-12 14:38 ` Will Deacon
2012-11-12 14:38 ` Will Deacon
2012-11-12 15:09 ` Rob Clark
2012-11-12 15:09 ` Rob Clark
2012-11-12 19:27 ` Russell King - ARM Linux
2012-11-12 19:27 ` Russell King - ARM Linux
2012-11-12 19:58 ` Rob Clark
2012-11-12 19:58 ` Rob Clark
2012-11-12 23:08 ` Russell King - ARM Linux
2012-11-12 23:08 ` Russell King - ARM Linux
2012-11-12 23:33 ` Rob Clark
2012-11-12 23:33 ` Rob Clark
2012-11-12 23:53 ` Russell King - ARM Linux
2012-11-12 23:53 ` Russell King - ARM Linux
2012-11-13 0:31 ` Rob Clark
2012-11-13 0:31 ` Rob Clark
2012-11-13 9:11 ` Arnd Bergmann
2012-11-13 9:11 ` Arnd Bergmann
2012-11-13 11:24 ` Russell King - ARM Linux
2012-11-13 11:24 ` Russell King - ARM Linux
2012-11-15 9:19 ` Arnd Bergmann [this message]
2012-11-15 9:19 ` Arnd Bergmann
2012-11-15 13:04 ` Rob Clark
2012-11-15 13:04 ` Rob Clark
2012-11-15 13:39 ` Arnd Bergmann
2012-11-15 13:39 ` Arnd Bergmann
2012-11-15 13:46 ` Rob Clark
2012-11-15 13:46 ` Rob Clark
2012-11-15 14:39 ` Arnd Bergmann
2012-11-15 14:39 ` Arnd Bergmann
2012-11-19 14:32 ` Ville Syrjälä
2012-11-19 14:32 ` Ville Syrjälä
2012-11-19 14:48 ` Russell King - ARM Linux
2012-11-19 14:48 ` Russell King - ARM Linux
2012-11-19 14:48 ` Russell King - ARM Linux
2012-11-19 15:18 ` Ville Syrjälä
2012-11-19 15:18 ` Ville Syrjälä
2012-11-19 15:18 ` Ville Syrjälä
2012-11-13 11:04 ` Russell King - ARM Linux
2012-11-13 11:04 ` Russell King - ARM Linux
-- strict thread matches above, loose matches on Subject: below --
2012-11-13 15:00 Rob Clark
2012-11-13 15:00 ` Rob Clark
2012-11-15 22:01 Rob Clark
2012-11-15 22:01 ` Rob Clark
2012-11-15 22:22 ` Nicolas Pitre
2012-11-15 22:22 ` Nicolas Pitre
2012-11-16 8:18 ` Arnd Bergmann
2012-11-16 8:18 ` Arnd Bergmann
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