Hi Cai, Thank you for the patch! Yet something to improve: [auto build test ERROR on powerpc/next] [also build test ERROR on v5.15 next-20211112] [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/Cai-Huoqing/tpm-ibmvtpm-Make-use... base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next config: powerpc64-randconfig-r026-20211027 (attached as .config) compiler: powerpc64-linux-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/8ef2c12d78e4782c08edad10706785961... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Cai-Huoqing/tpm-ibmvtpm-Make-use-of-dma_alloc_noncoherent/20211012-112627 git checkout 8ef2c12d78e4782c08edad107067859612cdb39e # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash 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/char/tpm/tpm_ibmvtpm.c: In function 'tpm_ibmvtpm_remove': 359 | dma_free_noncoherent(ibmvtpm->dev, CRQ_RES_BUF_SIZE, crq_q->crq_addr, | ^~~~~ drivers/char/tpm/tpm_ibmvtpm.c:359:62: note: each undeclared identifier is reported only once for each function it appears in drivers/char/tpm/tpm_ibmvtpm.c: In function 'tpm_ibmvtpm_probe': 690 | crq_q->crq_dma_handle, DMA_BIDIRECTIONAL); | ^~ vim +/crq_q +359 drivers/char/tpm/tpm_ibmvtpm.c 336 337 /** 338 * tpm_ibmvtpm_remove - ibm vtpm remove entry point 339 * @vdev: vio device struct 340 * 341 * Return: Always 0. 342 */ 343 static void tpm_ibmvtpm_remove(struct vio_dev *vdev) 344 { 345 struct tpm_chip *chip = dev_get_drvdata(&vdev->dev); 346 struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev); 347 int rc = 0; 348 349 tpm_chip_unregister(chip); 350 351 free_irq(vdev->irq, ibmvtpm); 352 353 do { 354 if (rc) 355 msleep(100); 356 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address); 357 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); 358 360 crq_q->crq_dma_handle, DMA_BIDIRECTIONAL); 361 362 if (ibmvtpm->rtce_buf) 363 dma_free_noncoherent(ibmvtpm->dev, 364 ibmvtpm->rtce_size, ibmvtpm->rtce_buf, 365 ibmvtpm->rtce_dma_handle, DMA_BIDIRECTIONAL); 366 367 kfree(ibmvtpm); 368 /* For tpm_ibmvtpm_get_desired_dma */ 369 dev_set_drvdata(&vdev->dev, NULL); 370 } 371 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org