Hi Xin, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on net/master] url: https://github.com/0day-ci/linux/commits/Xin-Long/security-fixups-for-the... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git 397430b50a363d8b7bdda00522123f82df6adc5e config: hexagon-randconfig-r041-20211025 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project a461fa64bb37cffd73f683c74f6b0780379fc2ca) 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/32fba59611e67404b515f7864aa67a3ab... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xin-Long/security-fixups-for-the-security-hooks-in-sctp/20211022-143827 git checkout 32fba59611e67404b515f7864aa67a3abd2f7978 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=hexagon 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 >>): In file included from drivers/gpu/drm/vgem/vgem_drv.c:36: In file included from include/linux/shmem_fs.h:11: In file included from include/linux/fs_parser.h:11: In file included from include/linux/fs_context.h:14: include/linux/security.h:1651:2: error: void function 'security_sctp_assoc_established' should not return a value [-Wreturn-type] return 0; ^ ~ DMA_BIT_MASK(64)); ^~~~~~~~~~~~~~~~ include/linux/dma-mapping.h:76:54: note: expanded from macro 'DMA_BIT_MASK' #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) ^ ~~~ 1 warning and 1 error generated. vim +460 drivers/gpu/drm/vgem/vgem_drv.c 502e95c6678505 Zach Reizner 2015-03-04 444 502e95c6678505 Zach Reizner 2015-03-04 445 static int __init vgem_init(void) 502e95c6678505 Zach Reizner 2015-03-04 446 { 502e95c6678505 Zach Reizner 2015-03-04 447 int ret; bcc0ef7f57e51e Daniel Vetter 2020-09-09 448 struct platform_device *pdev; 502e95c6678505 Zach Reizner 2015-03-04 449 bcc0ef7f57e51e Daniel Vetter 2020-09-09 450 pdev = platform_device_register_simple("vgem", -1, NULL, 0); bcc0ef7f57e51e Daniel Vetter 2020-09-09 451 if (IS_ERR(pdev)) bcc0ef7f57e51e Daniel Vetter 2020-09-09 452 return PTR_ERR(pdev); e2aff44868ae60 Laura Abbott 2017-05-04 453 bcc0ef7f57e51e Daniel Vetter 2020-09-09 454 if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) { bcc0ef7f57e51e Daniel Vetter 2020-09-09 455 ret = -ENOMEM; bcc0ef7f57e51e Daniel Vetter 2020-09-09 456 goto out_unregister; 502e95c6678505 Zach Reizner 2015-03-04 457 } 502e95c6678505 Zach Reizner 2015-03-04 458 bcc0ef7f57e51e Daniel Vetter 2020-09-09 459 dma_coerce_mask_and_coherent(&pdev->dev, e2aff44868ae60 Laura Abbott 2017-05-04 @460 DMA_BIT_MASK(64)); bcc0ef7f57e51e Daniel Vetter 2020-09-09 461 bcc0ef7f57e51e Daniel Vetter 2020-09-09 462 vgem_device = devm_drm_dev_alloc(&pdev->dev, &vgem_driver, bcc0ef7f57e51e Daniel Vetter 2020-09-09 463 struct vgem_device, drm); bcc0ef7f57e51e Daniel Vetter 2020-09-09 464 if (IS_ERR(vgem_device)) { bcc0ef7f57e51e Daniel Vetter 2020-09-09 465 ret = PTR_ERR(vgem_device); bcc0ef7f57e51e Daniel Vetter 2020-09-09 466 goto out_devres; bcc0ef7f57e51e Daniel Vetter 2020-09-09 467 } bcc0ef7f57e51e Daniel Vetter 2020-09-09 468 vgem_device->platform = pdev; e2aff44868ae60 Laura Abbott 2017-05-04 469 315f0242aa2b1e Chris Wilson 2017-05-08 470 /* Final step: expose the device/driver to userspace */ 315f0242aa2b1e Chris Wilson 2017-05-08 471 ret = drm_dev_register(&vgem_device->drm, 0); 502e95c6678505 Zach Reizner 2015-03-04 472 if (ret) bcc0ef7f57e51e Daniel Vetter 2020-09-09 473 goto out_devres; 502e95c6678505 Zach Reizner 2015-03-04 474 502e95c6678505 Zach Reizner 2015-03-04 475 return 0; 502e95c6678505 Zach Reizner 2015-03-04 476 bcc0ef7f57e51e Daniel Vetter 2020-09-09 477 out_devres: bcc0ef7f57e51e Daniel Vetter 2020-09-09 478 devres_release_group(&pdev->dev, NULL); d5c04dff24870e Deepak Sharma 2018-10-23 479 out_unregister: bcc0ef7f57e51e Daniel Vetter 2020-09-09 480 platform_device_unregister(pdev); 502e95c6678505 Zach Reizner 2015-03-04 481 return ret; 502e95c6678505 Zach Reizner 2015-03-04 482 } 502e95c6678505 Zach Reizner 2015-03-04 483 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org