[Bug 79670] [BYT] igt/gem_exec_big fails, with ppgtt enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79670

--- Comment #7 from Guo Jinxian <jinxianx.guo at intel.com> ---
Created attachment 100691
  --> https://bugs.freedesktop.org/attachment.cgi?id=100691&action=edit
dmesg with patch

(In reply to comment #5)
> Created attachment 100505 [details] [review]
> clflush ptes
> 
> Please test this - I don't have a byt myself so can't check myself ...

With this patch, the result was fail.
Output:
./gem_exec_big
IGT-Version: 1.6-g18d2130 (x86_64) (Linux: 3.15.0-rc3_kcloud_10dca6_20140609+
x86_64)
Test assertion failure function exec, file gem_exec_big.c:95:
Last errno: 0, Success
Failed assertion: tmp == gem_reloc[0].presumed_offset

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