DragonFlyBSD

Commit 7ec9f8e589bca0a drm/i915/gem: Switch to the Linux scatterlist API
does a bit more than that. Commenting out the newly added

if (args->flags & ~(I915_MMAP_WC))
        return -EINVAL;

in i915_gem.c allows an Asrock Z77M motherboard machine using current pkgsrc with dports patches backported to once again startx xfce4.

Given that using packages from dports on the same machine allows startx xfce4, it would appear the fault is mine for using a hacked version of pkgsrc; nonetheless, I don't have the slightest idea what to do in userspace to avoid the conflict with the newly added check.

As an aside, I don't understand the logic of the following code in i915_gem_gtt.c, so in the attached diff the addition is commented out as well:

ppgtt->base.allocate_va_range = aliasing ? NULL : gen6_alloc_va_range;
    ppgtt->base.allocate_va_range = gen6_alloc_va_range;