Re: [PATCH] ARM: add get_user() support for 8 byte types

Arnd Bergmann
2012-11-16T08:18:12Z

On Thursday 15 November 2012, 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()).
>
> v1: original
> v2: pass correct size to check_uaccess, and better handling of narrowing
> double word read with __get_user_xb() (Russell King's suggestion)
> v3: explain in comment about why this works for narrowing fetch to 1,
> 2, or 4 byte type on ARM.
>
> Signed-off-by: Rob Clark <rob@ti.com>

Acked-by: Arnd Bergmann <arnd@arndb.de>