tree: https://github.com/intel/linux-intel-lts.git 5.4/preempt-rt head: 646a89c49751509d6493602ca6df16e229574d24 commit: 9b07a958f2eb496c88faf0bd749eb600357f4190 [9719/19036] crypto: keembay: Add Keem Bay OCS HCU config: x86_64-randconfig-s021-20211001 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/intel/linux-intel-lts/commit/9b07a958f2eb496c88faf0bd7... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 5.4/preempt-rt git checkout 9b07a958f2eb496c88faf0bd749eb600357f4190 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/crypto/keembay/ 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/crypto/keembay/keembay-ocs-hcu-core.c:219:31: sparse: sparse: Using plain integer as NULL pointer drivers/crypto/keembay/keembay-ocs-hcu-core.c:749:31: sparse: sparse: Using plain integer as NULL pointer drivers/crypto/keembay/keembay-ocs-hcu-core.c:750:31: sparse: sparse: Using plain integer as NULL pointer vim +218 drivers/crypto/keembay/keembay-ocs-hcu-core.c 202 203 static void kmb_ocs_free_dma_list(struct ocs_hcu_rctx *rctx) 204 { 205 struct ocs_hcu_dev *hcu_dev = rctx->hcu_dev; 206 struct device *dev = hcu_dev->dev; 207 208 if (!rctx->dma_list_head || !rctx->dma_list_tail) 209 return; 210 211 if (rctx->sg_dma_nents > 0) 212 dma_unmap_sg(dev, hcu_dev->req->src, rctx->sg_dma_nents, 213 DMA_TO_DEVICE); 214 215 dma_free_coherent(dev, rctx->dma_list_size, rctx->dma_list_head, 216 rctx->ll_dma_addr); 217 219 rctx->dma_list_tail = 0; 220 rctx->ll_dma_addr = 0; 221 } 222 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org