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charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Simon, First bad commit (maybe !=3D root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git vga head: 21b082bd2a45704a6f7e69c190c8287a3d011ea9 commit: dc582b5ed4b749335b947258d4874df628726632 [3/5] PCI/VGA: Mark vga_ge= t() and wrappers as __must_check config: x86_64-randconfig-011-20260329 (https://download.01.org/0day-ci/arc= hive/20260330/202603300336.G53JumVL-lkp@intel.com/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f022= 7cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=3D1 build): (https://download.01.org/0day-ci/archive= /20260330/202603300336.G53JumVL-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new versio= n of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202603300336.G53JumVL-lkp@i= ntel.com/ All errors (new ones prefixed by >>): >> drivers/gpu/drm/i915/display/intel_vga.c:68:2: error: ignoring return va= lue of function declared with 'warn_unused_result' attribute [-Werror,-Wunu= sed-result] 68 | vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO); | ^~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/i915/display/intel_vga.c:93:2: error: ignoring return va= lue of function declared with 'warn_unused_result' attribute [-Werror,-Wunu= sed-result] 93 | vga_get_uninterruptible(pdev, VGA_RSRC_LEGACY_IO); | ^~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~ 2 errors generated. vim +/warn_unused_result +68 drivers/gpu/drm/i915/display/intel_vga.c 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 43 =20 4fb8783165b7c6 Jani Nikula 2019-10-01 44 /* Disable the VGA plane that = we never use */ 4b6e05c43b7542 Ville Syrj=C3=A4l=C3=A4 2024-09-06 45 void intel_vga_disab= le(struct intel_display *display) 4fb8783165b7c6 Jani Nikula 2019-10-01 46 { 4b6e05c43b7542 Ville Syrj=C3=A4l=C3=A4 2024-09-06 47 struct pci_dev *pde= v =3D to_pci_dev(display->drm->dev); 4b6e05c43b7542 Ville Syrj=C3=A4l=C3=A4 2024-09-06 48 i915_reg_t vga_reg = =3D intel_vga_cntrl_reg(display); 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 49 enum pipe pipe; 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 50 u32 tmp; 4fb8783165b7c6 Jani Nikula 2019-10-01 51 u8 sr1; 4fb8783165b7c6 Jani Nikula 2019-10-01 52 =20 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 53 tmp =3D intel_de_re= ad(display, vga_reg); 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 54 if (tmp & VGA_DISP_= DISABLE) a3af0140663dc3 Emil Velikov 2021-06-04 55 return; a3af0140663dc3 Emil Velikov 2021-06-04 56 =20 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 57 if (display->platfo= rm.cherryview) 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 58 pipe =3D REG_FIELD= _GET(VGA_PIPE_SEL_MASK_CHV, tmp); 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 59 else if (has_vga_pi= pe_sel(display)) 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 60 pipe =3D REG_FIELD= _GET(VGA_PIPE_SEL_MASK, tmp); 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 61 else 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 62 pipe =3D PIPE_A; 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 63 =20 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 64 drm_dbg_kms(display= ->drm, "Disabling VGA plane on pipe %c\n", 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 65 pipe_name(pipe= )); 0c80d60ae63461 Ville Syrj=C3=A4l=C3=A4 2025-04-17 66 =20 4fb8783165b7c6 Jani Nikula 2019-10-01 67 /* WaEnableVGAAccessThroughIO= Port: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 =3D inb(VGA_SEQ_D); f0bb41fad02e03 Jani Nikula 2022-02-02 71 outb(sr1 | VGA_SR01_SCREEN_OF= F, 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 =20 4b6e05c43b7542 Ville Syrj=C3=A4l=C3=A4 2024-09-06 75 intel_de_write(disp= lay, vga_reg, VGA_DISP_DISABLE); 4b6e05c43b7542 Ville Syrj=C3=A4l=C3=A4 2024-09-06 76 intel_de_posting_re= ad(display, vga_reg); 4fb8783165b7c6 Jani Nikula 2019-10-01 77 } 4fb8783165b7c6 Jani Nikula 2019-10-01 78 =20 :::::: The code at line 68 was first introduced by commit :::::: 4fb8783165b7c6fb4b52428dbb80da8554e5fd1e drm/i915/display: abstract = all vgaarb access to intel_vga.[ch] :::::: TO: Jani Nikula :::::: CC: Jani Nikula --=20 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki