12 Nov
2012
12 Nov
'12
7:27 p.m.
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.