Hi Simon, kernel test robot noticed the following build warnings:
[auto build test WARNING on 9702969978695d9a699a1f34771580cdbb153b33] url: https://github.com/intel-lab-lkp/linux/commits/Simon-Richter/vgaarb-pass-vga_get-errors-to-userspace/20260218-010647 base: 9702969978695d9a699a1f34771580cdbb153b33 patch link: https://lore.kernel.org/r/20260217170419.236739-4-Simon.Richter%40hogyros.de patch subject: [PATCH 3/5] vgaarb: mark vga_get family as __must_check config: powerpc-randconfig-002-20260218 (https://download.01.org/0day-ci/archive/20260218/[email protected]/config) compiler: powerpc-linux-gcc (GCC) 8.5.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260218/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): drivers/gpu/drm/i915/display/intel_vga.c: In function 'intel_vga_disable': >> drivers/gpu/drm/i915/display/intel_vga.c:68:2: warning: ignoring return >> value of 'vga_get_uninterruptible', declared with attribute >> warn_unused_result [-Wunused-result] vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/display/intel_vga.c: In function 'intel_vga_reset_io_mem': drivers/gpu/drm/i915/display/intel_vga.c:93:2: warning: ignoring return value of 'vga_get_uninterruptible', declared with attribute warn_unused_result [-Wunused-result] vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/vga_get_uninterruptible +68 drivers/gpu/drm/i915/display/intel_vga.c 0c80d60ae63461 Ville Syrjälä 2025-04-17 43 4fb8783165b7c6 Jani Nikula 2019-10-01 44 /* Disable the VGA plane that we never use */ 4b6e05c43b7542 Ville Syrjälä 2024-09-06 45 void intel_vga_disable(struct intel_display *display) 4fb8783165b7c6 Jani Nikula 2019-10-01 46 { 4b6e05c43b7542 Ville Syrjälä 2024-09-06 47 struct pci_dev *pdev = to_pci_dev(display->drm->dev); 4b6e05c43b7542 Ville Syrjälä 2024-09-06 48 i915_reg_t vga_reg = intel_vga_cntrl_reg(display); 0c80d60ae63461 Ville Syrjälä 2025-04-17 49 enum pipe pipe; 0c80d60ae63461 Ville Syrjälä 2025-04-17 50 u32 tmp; 4fb8783165b7c6 Jani Nikula 2019-10-01 51 u8 sr1; 4fb8783165b7c6 Jani Nikula 2019-10-01 52 0c80d60ae63461 Ville Syrjälä 2025-04-17 53 tmp = intel_de_read(display, vga_reg); 0c80d60ae63461 Ville Syrjälä 2025-04-17 54 if (tmp & VGA_DISP_DISABLE) a3af0140663dc3 Emil Velikov 2021-06-04 55 return; a3af0140663dc3 Emil Velikov 2021-06-04 56 0c80d60ae63461 Ville Syrjälä 2025-04-17 57 if (display->platform.cherryview) 0c80d60ae63461 Ville Syrjälä 2025-04-17 58 pipe = REG_FIELD_GET(VGA_PIPE_SEL_MASK_CHV, tmp); 0c80d60ae63461 Ville Syrjälä 2025-04-17 59 else if (has_vga_pipe_sel(display)) 0c80d60ae63461 Ville Syrjälä 2025-04-17 60 pipe = REG_FIELD_GET(VGA_PIPE_SEL_MASK, tmp); 0c80d60ae63461 Ville Syrjälä 2025-04-17 61 else 0c80d60ae63461 Ville Syrjälä 2025-04-17 62 pipe = PIPE_A; 0c80d60ae63461 Ville Syrjälä 2025-04-17 63 0c80d60ae63461 Ville Syrjälä 2025-04-17 64 drm_dbg_kms(display->drm, "Disabling VGA plane on pipe %c\n", 0c80d60ae63461 Ville Syrjälä 2025-04-17 65 pipe_name(pipe)); 0c80d60ae63461 Ville Syrjälä 2025-04-17 66 4fb8783165b7c6 Jani Nikula 2019-10-01 67 /* WaEnableVGAAccessThroughIOPort:ctg,elk,ilk,snb,ivb,vlv,hsw */ 4fb8783165b7c6 Jani Nikula 2019-10-01 @68 vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO); f0bb41fad02e03 Jani Nikula 2022-02-02 69 outb(0x01, VGA_SEQ_I); f0bb41fad02e03 Jani Nikula 2022-02-02 70 sr1 = inb(VGA_SEQ_D); f0bb41fad02e03 Jani Nikula 2022-02-02 71 outb(sr1 | VGA_SR01_SCREEN_OFF, VGA_SEQ_D); 4fb8783165b7c6 Jani Nikula 2019-10-01 72 vga_put(pdev, VGA_RSRC_LEGACY_IO); 4fb8783165b7c6 Jani Nikula 2019-10-01 73 udelay(300); 4fb8783165b7c6 Jani Nikula 2019-10-01 74 4b6e05c43b7542 Ville Syrjälä 2024-09-06 75 intel_de_write(display, vga_reg, VGA_DISP_DISABLE); 4b6e05c43b7542 Ville Syrjälä 2024-09-06 76 intel_de_posting_read(display, vga_reg); 4fb8783165b7c6 Jani Nikula 2019-10-01 77 } 4fb8783165b7c6 Jani Nikula 2019-10-01 78 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
