Messages in this thread | | | Date | Mon, 12 Nov 2012 19:27:27 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH] ARM: add get_user() support for 8 byte types |
| |
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.
| |