Comment # 8 on bug 93458 from Ilia Mirkin

This should be now upstream with

commit 78a121d82da8aff3aca2a6a1c40f5061081760f0
Author: Ilia Mirkin <imirkin@alum.mit.edu>
Date:   Sun Mar 6 16:06:06 2016 -0500

    drm/nouveau/core: use vzalloc for allocating ramht

    Most calls to nvkm_ramht_new use 0x8000 as the size. This results in a
    fairly sizeable chunk of memory to be allocated, which may not be
    available with kzalloc. Since this is done fairly rarely (once per
    channel), use vzalloc instead.

    Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
    Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Zlatko - I didn't realize (or perhaps totally forgot) you had provided the same
patch, didn't mean to steal credit or anything like that. Just ran into the
same issue myself and sent a patch. In the future, feel free to send patches to
the mailing list.

This issue should be resolved in v4.6-rc1+.