From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Rob Clark <rob.clark@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org, patches@linaro.org,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org,
dri-devel@lists.freedesktop.org, Arnd Bergmann <arnd@arndb.de>,
Rob Clark <rob@ti.com>
Subject: Re: [PATCH] ARM: add get_user() support for 8 byte types
Date: Mon, 12 Nov 2012 19:27:27 +0000 [thread overview]
Message-ID: <20121112192727.GB28341@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1352495853-9790-1-git-send-email-rob.clark@linaro.org>
On Fri, Nov 09, 2012 at 03:17:33PM -0600, Rob Clark wrote:
> From: Rob Clark <rob@ti.com>
>
> A new atomic modeset/pageflip ioctl being developed in DRM requires
> get_user() to work for 64bit types (in addition to just put_user()).
NAK.
(I did write a better email explaining all the ins and outs of why this
won't work and why 64-bit get_user isn't possible, but my editor crapped
out and lost all that well written message; I don't fancy typing it all
out again.)
Nevertheless,
int test_ptr(unsigned int **v, unsigned int **p)
{
return get_user(*v, p);
}
produces a warning, and you can't get away from that if you stick 64-bit
support into get_user().
Sorry, 64-bit get_user() is a no-no.
next prev parent reply other threads:[~2012-11-12 19:27 UTC|newest]
Thread overview: 26+ 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
2012-11-12 10:46 ` Will Deacon
2012-11-12 13:46 ` Rob Clark
2012-11-12 14:38 ` Will Deacon
2012-11-12 15:09 ` Rob Clark
2012-11-12 19:27 ` Russell King - ARM Linux [this message]
2012-11-12 19:58 ` Rob Clark
2012-11-12 23:08 ` Russell King - ARM Linux
2012-11-12 23:33 ` Rob Clark
2012-11-12 23:53 ` Russell King - ARM Linux
2012-11-13 0:31 ` Rob Clark
2012-11-13 9:11 ` Arnd Bergmann
2012-11-13 11:24 ` Russell King - ARM Linux
2012-11-15 9:19 ` Arnd Bergmann
2012-11-15 13:04 ` Rob Clark
2012-11-15 13:39 ` Arnd Bergmann
2012-11-15 13:46 ` Rob Clark
2012-11-15 14:39 ` Arnd Bergmann
2012-11-19 14:32 ` Ville Syrjälä
2012-11-19 14:48 ` Russell King - ARM Linux
2012-11-19 15:18 ` Ville Syrjälä
2012-11-13 11:04 ` Russell King - ARM Linux
2012-11-13 15:00 Rob Clark
2012-11-15 22:01 Rob Clark
2012-11-15 22:22 ` Nicolas Pitre
2012-11-16 8:18 ` Arnd Bergmann
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