Hi Minchan, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.11-rc7 next-20210125] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Minchan-Kim/dma-buf-system_heap-... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e0756cfc7d7cd08c98a53b6009c091a3f6a50be6 config: i386-randconfig-s002-20210209 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://github.com/0day-ci/linux/commit/28176611ddc50d5d84aa71679f32b0b22... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Minchan-Kim/dma-buf-system_heap-do-not-warn-for-costly-allocation/20210211-003048 git checkout 28176611ddc50d5d84aa71679f32b0b22dbf4b1c # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/dma-buf/heaps/system_heap.c:327:27: sparse: expected unsigned long gfp_flags drivers/dma-buf/heaps/system_heap.c:327:27: sparse: got restricted gfp_t drivers/dma-buf/heaps/system_heap.c:331:36: sparse: expected restricted gfp_t [usertype] gfp_mask drivers/dma-buf/heaps/system_heap.c:331:36: sparse: got unsigned long gfp_flags vim +327 drivers/dma-buf/heaps/system_heap.c 313 314 static struct page *alloc_largest_available(unsigned long size, 315 unsigned int max_order) 316 { 317 struct page *page; 318 unsigned long gfp_flags; 319 int i; 320 321 for (i = 0; i < NUM_ORDERS; i++) { 322 if (size < (PAGE_SIZE << orders[i])) 323 continue; 324 if (max_order < orders[i]) 325 continue; 326 328 if (orders[i] > PAGE_ALLOC_COSTLY_ORDER) 330 332 if (!page) 333 continue; 334 return page; 335 } 336 return NULL; 337 } 338 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org