tree: git://people.freedesktop.org/~thomash/linux topic/ttm_branch_v2 head: 3babe7d4c273bb8aadecba9dfe8f7fac05b03f57 commit: 54097c7d6c70404023812e2c9f3bea4a06f2c5c7 [3/7] drm/i915, drm/ttm: Initialize the ttm device and memory managers. config: x86_64-randconfig-a004-20210510 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): git remote add thomash git://people.freedesktop.org/~thomash/linux git fetch --no-tags thomash topic/ttm_branch_v2 git checkout 54097c7d6c70404023812e2c9f3bea4a06f2c5c7 # save the attached .config to linux build tree make W=1 W=1 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 warnings (new ones prefixed by >>): vim +99 drivers/gpu/drm/i915/intel_memory_region.c 232a6ebae41919 Matthew Auld 2019-10-08 86 54097c7d6c7040 Thomas Hellström 2021-04-22 87 /** 54097c7d6c7040 Thomas Hellström 2021-04-22 88 * intel_memory_region_unreserve - Unreserve all previously reserved 54097c7d6c7040 Thomas Hellström 2021-04-22 89 * ranges 54097c7d6c7040 Thomas Hellström 2021-04-22 90 * @mem: The region for which we want to reserve a subrange. 54097c7d6c7040 Thomas Hellström 2021-04-22 91 * @offset: Start of the subrange to reserve- 54097c7d6c7040 Thomas Hellström 2021-04-22 92 * @size: The size of the subrange to reserve. 54097c7d6c7040 Thomas Hellström 2021-04-22 93 * 54097c7d6c7040 Thomas Hellström 2021-04-22 94 * Return: 0 on success, negative error code on failure. 54097c7d6c7040 Thomas Hellström 2021-04-22 95 */ 54097c7d6c7040 Thomas Hellström 2021-04-22 96 int intel_memory_region_reserve(struct intel_memory_region *mem, 54097c7d6c7040 Thomas Hellström 2021-04-22 97 resource_size_t offset, 54097c7d6c7040 Thomas Hellström 2021-04-22 98 resource_size_t size) 232a6ebae41919 Matthew Auld 2019-10-08 @99 { 232a6ebae41919 Matthew Auld 2019-10-08 100 int ret; 54097c7d6c7040 Thomas Hellström 2021-04-22 101 struct intel_region_reserve *reserve; 232a6ebae41919 Matthew Auld 2019-10-08 102 54097c7d6c7040 Thomas Hellström 2021-04-22 103 if (!mem->priv_ops || !mem->priv_ops->reserve) 54097c7d6c7040 Thomas Hellström 2021-04-22 104 return -EINVAL; 232a6ebae41919 Matthew Auld 2019-10-08 105 54097c7d6c7040 Thomas Hellström 2021-04-22 106 reserve = kzalloc(sizeof(*reserve), GFP_KERNEL); 54097c7d6c7040 Thomas Hellström 2021-04-22 107 if (!reserve) 54097c7d6c7040 Thomas Hellström 2021-04-22 108 return -ENOMEM; 232a6ebae41919 Matthew Auld 2019-10-08 109 54097c7d6c7040 Thomas Hellström 2021-04-22 110 reserve->node = mem->priv_ops->reserve(mem, offset, size); 54097c7d6c7040 Thomas Hellström 2021-04-22 111 if (IS_ERR(reserve->node)) { 54097c7d6c7040 Thomas Hellström 2021-04-22 112 ret = PTR_ERR(reserve->node); 54097c7d6c7040 Thomas Hellström 2021-04-22 113 kfree(reserve); 54097c7d6c7040 Thomas Hellström 2021-04-22 114 return ret; 232a6ebae41919 Matthew Auld 2019-10-08 115 } 232a6ebae41919 Matthew Auld 2019-10-08 116 adeca641bcb64f Abdiel Janulgue 2021-01-27 117 mutex_lock(&mem->mm_lock); 54097c7d6c7040 Thomas Hellström 2021-04-22 118 list_add_tail(&reserve->link, &mem->reserved); adeca641bcb64f Abdiel Janulgue 2021-01-27 119 mutex_unlock(&mem->mm_lock); adeca641bcb64f Abdiel Janulgue 2021-01-27 120 54097c7d6c7040 Thomas Hellström 2021-04-22 121 return 0; adeca641bcb64f Abdiel Janulgue 2021-01-27 122 } adeca641bcb64f Abdiel Janulgue 2021-01-27 123 :::::: The code at line 99 was first introduced by commit :::::: 232a6ebae419193f5b8da4fa869ae5089ab105c2 drm/i915: introduce intel_memory_region :::::: TO: Matthew Auld <matthew.auld(a)intel.com&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