Hi Lyude, kernel test robot noticed the following build warnings:
https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Lyude-Paul/drm-nouveau-kms-Add-INHERIT-ioctl-to-nvkm-nvif-for-reading-IOR-state/20230408-062329 base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next patch link: https://lore.kernel.org/r/20230407222133.1425969-2-lyude%40redhat.com patch subject: [PATCH 2/2] drm/nouveau/kms: Add INHERIT ioctl to nvkm/nvif for reading IOR state config: csky-randconfig-m031-20230409 (https://download.01.org/0day-ci/archive/20230409/202304091929.sr0cfhln-...@intel.com/config) compiler: csky-linux-gcc (GCC) 12.1.0 If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <l...@intel.com> | Reported-by: Dan Carpenter <erro...@gmail.com> | Link: https://lore.kernel.org/r/202304091929.sr0cfhln-...@intel.com/ New smatch warnings: drivers/gpu/drm/nouveau/dispnv50/disp.c:2518 nv50_display_read_hw_or_state() error: uninitialized symbol 'head_idx'. vim +/head_idx +2518 drivers/gpu/drm/nouveau/dispnv50/disp.c a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2477 static inline void a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2478 nv50_display_read_hw_or_state(struct drm_device *dev, struct nv50_disp *disp, a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2479 struct nouveau_encoder *outp) a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2480 { a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2481 struct drm_crtc *crtc; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2482 struct drm_connector_list_iter conn_iter; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2483 struct drm_connector *conn; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2484 struct nv50_head_atom *armh; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2485 const u32 encoder_mask = drm_encoder_mask(&outp->base.base); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2486 bool found_conn = false, found_head = false; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2487 u8 proto; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2488 int head_idx; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2489 int ret; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2490 a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2491 switch (outp->dcb->type) { a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2492 case DCB_OUTPUT_TMDS: a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2493 ret = nvif_outp_inherit_tmds(&outp->outp, &proto); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2494 break; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2495 case DCB_OUTPUT_DP: a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2496 ret = nvif_outp_inherit_dp(&outp->outp, &proto); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2497 break; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2498 case DCB_OUTPUT_LVDS: a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2499 ret = nvif_outp_inherit_lvds(&outp->outp, &proto); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2500 break; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2501 case DCB_OUTPUT_ANALOG: a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2502 ret = nvif_outp_inherit_rgb_crt(&outp->outp, &proto); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2503 break; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2504 default: a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2505 drm_dbg_kms(dev, "Readback for %s not implemented yet, skipping\n", a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2506 outp->base.base.name); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2507 drm_WARN_ON(dev, true); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2508 return; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2509 } a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2510 if (ret >= 0) { a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2511 head_idx = ret; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2512 ret = 0; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2513 } else if (ret == -ENODEV) { What if it fails with a different error code? a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2514 return; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2515 } a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2516 a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2517 drm_for_each_crtc(crtc, dev) { a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 @2518 if (crtc->index != head_idx) a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2519 continue; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2520 a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2521 armh = nv50_head_atom(crtc->state); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2522 found_head = true; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2523 break; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2524 } a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2525 if (drm_WARN_ON(dev, !found_head)) a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2526 return; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2527 a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2528 /* Figure out which connector is being used by this encoder */ a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2529 drm_connector_list_iter_begin(dev, &conn_iter); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2530 nouveau_for_each_non_mst_connector_iter(conn, &conn_iter) { a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2531 if (nouveau_connector(conn)->index == outp->dcb->connector) { a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2532 found_conn = true; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2533 break; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2534 } a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2535 } a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2536 drm_connector_list_iter_end(&conn_iter); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2537 if (drm_WARN_ON(dev, !found_conn)) a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2538 return; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2539 a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2540 armh->state.encoder_mask = encoder_mask; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2541 armh->state.connector_mask = drm_connector_mask(conn); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2542 armh->state.active = true; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2543 armh->state.enable = true; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2544 a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2545 outp->crtc = crtc; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2546 outp->ctrl = NVVAL(NV507D, SOR_SET_CONTROL, PROTOCOL, proto) | BIT(crtc->index); a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2547 a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2548 conn->state->crtc = crtc; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2549 conn->state->best_encoder = &outp->base.base; a3d963915cf6f2 drivers/gpu/drm/nouveau/dispnv50/disp.c Lyude Paul 2023-04-07 2550 } -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
