xf86-video-intel: fix yocto/oe-core wreckage from libdrm upgrade

In commit a117fd5ecdd9973c7e4d772d1785f1f4e9b162c2,
from OE-Core rev: 88d60e70da0890184922056cef1f20171f716ace
"libdrm: Upgrade to 2.4.62" we managed to break X like this:

[3602662.736] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics 4600
[3602662.736] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1, sse4.2, avx, avx2
[3602662.736] (II) intel(0): Creating default Display subsection in Screen section
        "Default Screen Section" for depth/fbbpp 24/32
[3602662.736] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[3602662.736] (==) intel(0): RGB weight 888
[3602662.736] (==) intel(0): Default visual is TrueColor
[3602662.736] (EE)
[3602662.736] (EE) Backtrace:
[3602662.736] (EE) 0: /usr/bin/X (xorg_backtrace+0x49) [0x56ae09]
[3602662.736] (EE) 1: /usr/bin/X (0x400000+0x16ecd9) [0x56ecd9]
[3602662.736] (EE) 2: /lib64/libpthread.so.0 (0x3330600000+0x105e0) [0x33306105e0]
[3602662.736] (EE)
[3602662.736] (EE) Segmentation fault at address 0x0
[3602662.736] (EE)
Fatal server error:
[3602662.736] (EE) Caught signal 11 (Segmentation fault). Server aborting

A mix of a ~1 month old (working) image and the failing image led me
to determine /usr/lib64/xorg/modules/drivers/intel_drv.so was bad.
However nothing changed the parent package xf86-video-intel in
yocto for months.

So brute force bisecting yocto leads to the above commit.  Inserting
libdrm as git and then bisecting the 2.4.59 --> 2.4.62 uprev content
leads to libdrm commit 8576527cfacaf42af8316e1030c192193e94225a
("intel: Merge latest i915_drm.h") -- specifically, the part of that
commit that adds __u64 flags to drm_i915_gem_mmap lands in our sysroot
and is used by the compile of xf86-video-intel.

With the specific trigger finally pinpointed, the final leap was to
correlate that trigger to the upstream xf86-video-intel commit that
accounts for the fallout of this libdrm header change, that we did
not yet have here.  Fun times.  Hopefully this complete description
here will ensure nobody else has to retrace these steps again.

Cc: Damien Lespiau <damien.lespiau@intel.com>
Cc: Neil Roberts <neil@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Steffen Pankratz <steffen.pankratz@elektrobit.com>
Cc: Ross Burton <ross.burton@intel.com>
Cc: Richard Purdie <richard.purdie@linuxfoundation.org>
(From OE-Core rev: c1df1da2a71aeb5956952e44c5f4ad669b6e770f)

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions