tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ee1703cda8dc777e937dec172da55beaf1a74919 commit: 068396bb21c8aa3b2f797c58eb9e623d7cf271bb drm/i915/ttm: Rework object initialization slightly date: 7 weeks ago config: x86_64-allyesconfig (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/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 068396bb21c8aa3b2f797c58eb9e623d7cf271bb # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/i915/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/gpu/drm/i915/gem/i915_gem_object.c:109: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Mark up the object's coherency levels for a given cache_level vim +102 drivers/gpu/drm/i915/gem/i915_gem_object.c 91 92 /** 93 * i915_gem_object_fini - Clean up a GEM object initialization 94 * @obj: The gem object to cleanup 95 * 96 * This function cleans up gem object fields that are set up by 97 * drm_gem_private_object_init() and i915_gem_object_init(). 98 * It's primarily intended as a helper for backends that need to 99 * clean up the gem object in separate steps. 100 */ 101 void __i915_gem_object_fini(struct drm_i915_gem_object *obj) 103 mutex_destroy(&obj->mm.get_page.lock); 104 mutex_destroy(&obj->mm.get_dma_page.lock); 105 dma_resv_fini(&obj->base._resv); 106 } 107 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org