tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1df0d8960499e58963fd6c8ac75e544f2b417b29 commit: 6863f5643dd717376c2fdc85a47a00f9d738a834 kbuild: allow Clang to find unused static inline functions for W=1 build date: 10 months ago config: x86_64-randconfig-a002-20200712 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 6863f5643dd717376c2fdc85a47a00f9d738a834 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): static inline void debug_fence_init_onstack(struct i915_sw_fence *fence) ^ static inline void debug_fence_free(struct i915_sw_fence *fence) ^ 2 errors generated. vim +/debug_fence_init_onstack +84 drivers/gpu/drm/i915/i915_sw_fence.c fc1584059d6c43 Chris Wilson 2016-11-25 83 214707fc2ce08d Chris Wilson 2017-10-12 @84 static inline void debug_fence_init_onstack(struct i915_sw_fence *fence) 214707fc2ce08d Chris Wilson 2017-10-12 85 { 214707fc2ce08d Chris Wilson 2017-10-12 86 } 214707fc2ce08d Chris Wilson 2017-10-12 87 fc1584059d6c43 Chris Wilson 2016-11-25 88 static inline void debug_fence_activate(struct i915_sw_fence *fence) fc1584059d6c43 Chris Wilson 2016-11-25 89 { fc1584059d6c43 Chris Wilson 2016-11-25 90 } fc1584059d6c43 Chris Wilson 2016-11-25 91 fc1584059d6c43 Chris Wilson 2016-11-25 92 static inline void debug_fence_set_state(struct i915_sw_fence *fence, fc1584059d6c43 Chris Wilson 2016-11-25 93 int old, int new) fc1584059d6c43 Chris Wilson 2016-11-25 94 { fc1584059d6c43 Chris Wilson 2016-11-25 95 } fc1584059d6c43 Chris Wilson 2016-11-25 96 fc1584059d6c43 Chris Wilson 2016-11-25 97 static inline void debug_fence_deactivate(struct i915_sw_fence *fence) fc1584059d6c43 Chris Wilson 2016-11-25 98 { fc1584059d6c43 Chris Wilson 2016-11-25 99 } fc1584059d6c43 Chris Wilson 2016-11-25 100 fc1584059d6c43 Chris Wilson 2016-11-25 101 static inline void debug_fence_destroy(struct i915_sw_fence *fence) fc1584059d6c43 Chris Wilson 2016-11-25 102 { fc1584059d6c43 Chris Wilson 2016-11-25 103 } fc1584059d6c43 Chris Wilson 2016-11-25 104 fc1584059d6c43 Chris Wilson 2016-11-25 @105 static inline void debug_fence_free(struct i915_sw_fence *fence) fc1584059d6c43 Chris Wilson 2016-11-25 106 { fc1584059d6c43 Chris Wilson 2016-11-25 107 } fc1584059d6c43 Chris Wilson 2016-11-25 108 :::::: The code at line 84 was first introduced by commit :::::: 214707fc2ce08d09982bc4fe4b7a1c1f010e82be drm/i915/selftests: Wrap a timer into a i915_sw_fence :::::: TO: Chris Wilson <chris(a)chris-wilson.co.uk&gt; :::::: CC: Chris Wilson <chris(a)chris-wilson.co.uk&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org