tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.15.y-rt-rebase
head:   05f564af7ff4cd9cc21645df2f0be6b3e6681ee6
commit: e1628c2aabb7f0a48dcbe3ec8ac97ba26b7d5fa2 [108/137] drm/i915/gt: Only disable interrupts for the timeline lock on !force-threaded
config: x86_64-rhel-8.3 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/commit/?id=e1628c2aabb7f0a48dcbe3ec8ac97ba26b7d5fa2
        git remote add rt-devel https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git
        git fetch --no-tags rt-devel linux-5.15.y-rt-rebase
        git checkout e1628c2aabb7f0a48dcbe3ec8ac97ba26b7d5fa2
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "force_irqthreads_key" [drivers/gpu/drm/i915/i915.ko] undefined!

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org