[Bug 110774] Xorg segfault on cpu which does not support PAT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110774

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
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                 CC|                            |chris at chris-wilson.co.uk,
                   |                            |kenneth at whitecape.org

--- Comment #1 from Kenneth Graunke <kenneth at whitecape.org> ---
I guess we need to detect this case in brw_bufmgr.c when it sets has_mmap_wc. 
Alternatively, the kernel (i915.ko) needs to not advertise WC map support
(I915_PARAM_MMAP_VERSION >= 1) when the CPU doesn't support it.

That's pretty unfortunate, I had hoped to assume WC maps were possible.

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