tree: https://github.com/0day-ci/linux/commits/UPDATE-20200821-181056/Chris-Wil... head: 38b0cab83068fdb9ea08a83d0aa478dea9dc0198 commit: 428d9f1a613ed8a93d2b6476ec1aeb95fe90dedc [2/4] drm/i915/gem: Sync the vmap PTEs upon construction config: i386-randconfig-a012-20200820 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): git checkout 428d9f1a613ed8a93d2b6476ec1aeb95fe90dedc # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): drivers/gpu/drm/i915/gem/i915_gem_pages.c: In function 'i915_gem_object_map': 307 | flush_vm_area(area); | ^~~~~~~~~~~~~ | free_vm_area cc1: some warnings being treated as errors # https://github.com/0day-ci/linux/commit/428d9f1a613ed8a93d2b6476ec1aeb95f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20200821-181056/Chris-Wilson/mm-Export-flush_vm_area-to-sync-the-PTEs-upon-construction/20200821-165232 git checkout 428d9f1a613ed8a93d2b6476ec1aeb95fe90dedc vim +307 drivers/gpu/drm/i915/gem/i915_gem_pages.c 243 244 /* The 'mapping' part of i915_gem_object_pin_map() below */ 245 static void *i915_gem_object_map(struct drm_i915_gem_object *obj, 246 enum i915_map_type type) 247 { 248 unsigned long n_pte = obj->base.size >> PAGE_SHIFT; 249 struct sg_table *sgt = obj->mm.pages; 250 pte_t *stack[32], **mem; 251 struct vm_struct *area; 252 pgprot_t pgprot; 253 254 if (!i915_gem_object_has_struct_page(obj) && type != I915_MAP_WC) 255 return NULL; 256 257 /* A single page can always be kmapped */ 258 if (n_pte == 1 && type == I915_MAP_WB) 259 return kmap(sg_page(sgt->sgl)); 260 261 mem = stack; 262 if (n_pte > ARRAY_SIZE(stack)) { 263 /* Too big for stack -- allocate temporary array instead */ 264 mem = kvmalloc_array(n_pte, sizeof(*mem), GFP_KERNEL); 265 if (!mem) 266 return NULL; 267 } 268 269 area = alloc_vm_area(obj->base.size, mem); 270 if (!area) { 271 if (mem != stack) 272 kvfree(mem); 273 return NULL; 274 } 275 276 switch (type) { 277 default: 278 MISSING_CASE(type); 279 /* fallthrough - to use PAGE_KERNEL anyway */ 280 case I915_MAP_WB: 281 pgprot = PAGE_KERNEL; 282 break; 283 case I915_MAP_WC: 284 pgprot = pgprot_writecombine(PAGE_KERNEL_IO); 285 break; 286 } 287 288 if (i915_gem_object_has_struct_page(obj)) { 289 struct sgt_iter iter; 290 struct page *page; 291 pte_t **ptes = mem; 292 293 for_each_sgt_page(page, iter, sgt) 294 **ptes++ = mk_pte(page, pgprot); 295 } else { 296 resource_size_t iomap; 297 struct sgt_iter iter; 298 pte_t **ptes = mem; 299 dma_addr_t addr; 300 301 iomap = obj->mm.region->iomap.base; 302 iomap -= obj->mm.region->region.start; 303 304 for_each_sgt_daddr(addr, iter, sgt) 305 **ptes++ = iomap_pte(iomap, addr, pgprot); 306 } 308 309 if (mem != stack) 310 kvfree(mem); 311 312 return area->addr; 313 } 314 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org