Hi Wayne, kernel test robot noticed the following build warnings:
[auto build test WARNING on drm-misc/drm-misc-next] [also build test WARNING on drm-intel/for-linux-next-fixes drm/drm-next linus/master v6.5-rc4 next-20230804] [cannot apply to drm-intel/for-linux-next] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Wayne-Lin/drm-mst-delete-unnecessary-case-in-drm_dp_add_payload_part2/20230804-142405 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next patch link: https://lore.kernel.org/r/20230804062029.5686-3-Wayne.Lin%40amd.com patch subject: [PATCH 2/3] drm/mst: Refactor the flow for payload allocation/removement config: s390-randconfig-r044-20230731 (https://download.01.org/0day-ci/archive/20230804/202308042253.lm5xmnna-...@intel.com/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a) reproduce: (https://download.01.org/0day-ci/archive/20230804/202308042253.lm5xmnna-...@intel.com/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 <l...@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202308042253.lm5xmnna-...@intel.com/ All warnings (new ones prefixed by >>): In file included from drivers/gpu/drm/nouveau/dispnv50/disp.c:24: In file included from drivers/gpu/drm/nouveau/dispnv50/disp.h:4: In file included from drivers/gpu/drm/nouveau/include/nvif/mem.h:3: In file included from drivers/gpu/drm/nouveau/include/nvif/mmu.h:3: In file included from drivers/gpu/drm/nouveau/include/nvif/object.h:4: In file included from drivers/gpu/drm/nouveau/include/nvif/os.h:8: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:75: 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/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu' 37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) | ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' 102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) | ^ In file included from drivers/gpu/drm/nouveau/dispnv50/disp.c:24: In file included from drivers/gpu/drm/nouveau/dispnv50/disp.h:4: In file included from drivers/gpu/drm/nouveau/include/nvif/mem.h:3: In file included from drivers/gpu/drm/nouveau/include/nvif/mmu.h:3: In file included from drivers/gpu/drm/nouveau/include/nvif/object.h:4: In file included from drivers/gpu/drm/nouveau/include/nvif/os.h:8: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:75: 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/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu' 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) | ^ include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32' 115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) | ^ In file included from drivers/gpu/drm/nouveau/dispnv50/disp.c:24: In file included from drivers/gpu/drm/nouveau/dispnv50/disp.h:4: In file included from drivers/gpu/drm/nouveau/include/nvif/mem.h:3: In file included from drivers/gpu/drm/nouveau/include/nvif/mmu.h:3: In file included from drivers/gpu/drm/nouveau/include/nvif/object.h:4: In file included from drivers/gpu/drm/nouveau/include/nvif/os.h:8: In file included from include/linux/pci.h:39: In file included from include/linux/io.h:13: In file included from arch/s390/include/asm/io.h:75: 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); | ~~~~~~~~~~ ^ include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 692 | readsb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 700 | readsw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 708 | readsl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 717 | writesb(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 726 | writesw(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] 735 | writesl(PCI_IOBASE + addr, buffer, count); | ~~~~~~~~~~ ^ >> drivers/gpu/drm/nouveau/dispnv50/disp.c:919:46: warning: variable >> 'old_payload' set but not used [-Wunused-but-set-variable] 919 | struct drm_dp_mst_atomic_payload *payload, *old_payload; | ^ 13 warnings generated. vim +/old_payload +919 drivers/gpu/drm/nouveau/dispnv50/disp.c f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 908 f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 909 static void 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 910 nv50_msto_prepare(struct drm_atomic_state *state, 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 911 struct drm_dp_mst_topology_state *mst_state, 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 912 struct drm_dp_mst_topology_mgr *mgr, 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 913 struct nv50_msto *msto) f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 914 { f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 915 struct nouveau_drm *drm = nouveau_drm(msto->encoder.dev); f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 916 struct nv50_mstc *mstc = msto->mstc; f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 917 struct nv50_mstm *mstm = mstc->mstm; 8fb3e25c3dd1a2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-06-13 918 struct drm_dp_mst_topology_state *old_mst_state; 8fb3e25c3dd1a2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-06-13 @919 struct drm_dp_mst_atomic_payload *payload, *old_payload; f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 920 f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 921 NV_ATOMIC(drm, "%s: msto prepare\n", msto->encoder.name); 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 922 8fb3e25c3dd1a2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-06-13 923 old_mst_state = drm_atomic_get_old_mst_topology_state(state, mgr); 8fb3e25c3dd1a2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-06-13 924 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 925 payload = drm_atomic_get_mst_payload_state(mst_state, mstc->port); 8fb3e25c3dd1a2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-06-13 926 old_payload = drm_atomic_get_mst_payload_state(old_mst_state, mstc->port); 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 927 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 928 // TODO: Figure out if we want to do a better job of handling VCPI allocation failures here? 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 929 if (msto->disabled) { c9e8c7f37133c0 drivers/gpu/drm/nouveau/dispnv50/disp.c Wayne Lin 2023-08-04 930 drm_dp_remove_payload_part1(mgr, mst_state, payload); 8c7d980da9ba3e drivers/gpu/drm/nouveau/dispnv50/disp.c Ben Skeggs 2022-06-01 931 8c7d980da9ba3e drivers/gpu/drm/nouveau/dispnv50/disp.c Ben Skeggs 2022-06-01 932 nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index, 0, 0, 0, 0); 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 933 } else { 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 934 if (msto->enabled) 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 935 drm_dp_add_payload_part1(mgr, mst_state, payload); 4d07b0bc403403 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2022-08-17 936 8c7d980da9ba3e drivers/gpu/drm/nouveau/dispnv50/disp.c Ben Skeggs 2022-06-01 937 nvif_outp_dp_mst_vcpi(&mstm->outp->outp, msto->head->base.index, 8c7d980da9ba3e drivers/gpu/drm/nouveau/dispnv50/disp.c Ben Skeggs 2022-06-01 938 payload->vc_start_slot, payload->time_slots, 8c7d980da9ba3e drivers/gpu/drm/nouveau/dispnv50/disp.c Ben Skeggs 2022-06-01 939 payload->pbn, payload->time_slots * mst_state->pbn_div); f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 940 } f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 941 } f479c0ba4a170a drivers/gpu/drm/nouveau/nv50_display.c Ben Skeggs 2016-11-04 942 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
