CC: kbuild-all(a)lists.01.org TO: Mike Galbraith <umgwanakikbuti(a)gmail.com&gt; CC: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de&gt; CC: Thomas Gleixner <tglx(a)linutronix.de&gt; Hi Mike, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-5.4.y-rt head: 1fbcaa9506f953b1f054c0d1ae79776fb77887b3 commit: f5bcd1ba26d178d80c1424195832325a2daa923b [206/261] drm,i915: Use local_lock/unlock_irq() in intel_pipe_update_start/end() config: x86_64-defconfig (attached as .config) compiler: clang version 10.0.0 (git://gitmirror/llvm_project 016bf03ef6fcd9dce43b0c17971f76323f07a684) reproduce: git checkout f5bcd1ba26d178d80c1424195832325a2daa923b # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): >> drivers/gpu/drm/i915/display/intel_sprite.c:84:30: warning: unused variable 'pipe_update_lock' [-Wunused-const-variable] static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock); ^ 1 warning generated. vim +/pipe_update_lock +84 drivers/gpu/drm/i915/display/intel_sprite.c 83 > 84 static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock); 85 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation