Hi Imre, kernel test robot noticed the following build warnings: [auto build test WARNING on drm-tip/drm-tip] url: https://github.com/intel-lab-lkp/linux/commits/Imre-Deak/drm-dp_mst-Store-the-MST-PBN-divider-value-in-fixed-point-format/20231116-212936 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip patch link: https://lore.kernel.org/r/20231116131841.1588781-4-imre.deak%40intel.com patch subject: [PATCH v2 03/11] drm/dp_mst: Add kunit tests for drm_dp_get_vc_payload_bw() config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20231119/202311190743.K2U2VXVT-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231119/202311190743.K2U2VXVT-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202311190743.K2U2VXVT-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/tests/drm_dp_mst_helper_test.c:10: In file included from include/drm/display/drm_dp_mst_helper.h:26: In file included from include/drm/display/drm_dp_helper.h:27: In file included from include/linux/i2c.h:19: In file included from include/linux/regulator/consumer.h:35: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:337: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 547 | val = __raw_readb(PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) | ^ In file included from drivers/gpu/drm/tests/drm_dp_mst_helper_test.c:10: In file included from include/drm/display/drm_dp_mst_helper.h:26: In file included from include/drm/display/drm_dp_helper.h:27: In file included from include/linux/i2c.h:19: In file included from include/linux/regulator/consumer.h:35: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:337: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); | ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) | ^ In file included from drivers/gpu/drm/tests/drm_dp_mst_helper_test.c:10: In file included from include/drm/display/drm_dp_mst_helper.h:26: In file included from include/drm/display/drm_dp_helper.h:27: In file included from include/linux/i2c.h:19: In file included from include/linux/regulator/consumer.h:35: In file included from include/linux/suspend.h:5: In file included from include/linux/swap.h:9: In file included from include/linux/memcontrol.h:13: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:11: In file included from ./arch/hexagon/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/hexagon/include/asm/io.h:337: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 584 | __raw_writeb(value, PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 594 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); | ~~~~~~~~~~ ^ >> drivers/gpu/drm/tests/drm_dp_mst_helper_test.c:197:13: warning: stack frame size (1664) exceeds limit (1024) in 'drm_test_dp_mst_calc_pbn_div' [-Wframe-larger-than] 197 | static void drm_test_dp_mst_calc_pbn_div(struct kunit *test) | ^ 7 warnings generated. vim +/drm_test_dp_mst_calc_pbn_div +197 drivers/gpu/drm/tests/drm_dp_mst_helper_test.c 196 > 197 static void drm_test_dp_mst_calc_pbn_div(struct kunit *test) 198 { 199 const struct drm_dp_mst_calc_pbn_div_test *params = test->param_value; 200 /* mgr->dev is only needed by drm_dbg_kms(), but it's not called for the test cases. */ 201 struct drm_dp_mst_topology_mgr mgr = {}; 202 203 KUNIT_EXPECT_EQ(test, drm_dp_get_vc_payload_bw(&mgr, params->link_rate, params->lane_count).full, 204 params->expected.full); 205 } 206 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
