[tobetter:odroid-5.19.y 51/99] drivers/gpu/drm/drm_mipi_dbi.c:77:17: warning: unused variable 'mipi_dbi_dcs_read_commands'
From: kernel test robot
Date: Wed Aug 03 2022 - 00:12:58 EST
Hi Dongjin,
First bad commit (maybe != root cause):
tree: https://github.com/tobetter/linux odroid-5.19.y
head: 7df5baf82efb498c71096e60e58d2bba6f4fb0e1
commit: 909850898b8e826a9df13be97cf03b0d01cf4b1b [51/99] ODROID-COMMON: gpu/drm: Add new Tiny DRM driver with Ili9488
config: s390-randconfig-c005-20220802 (https://download.01.org/0day-ci/archive/20220803/202208031219.1wtTDs54-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 52cd00cabf479aa7eb6dbb063b7ba41ea57bce9e)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://github.com/tobetter/linux/commit/909850898b8e826a9df13be97cf03b0d01cf4b1b
git remote add tobetter https://github.com/tobetter/linux
git fetch --no-tags tobetter odroid-5.19.y
git checkout 909850898b8e826a9df13be97cf03b0d01cf4b1b
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/gpu/drm/
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
In file included from drivers/gpu/drm/drm_mipi_dbi.c:13:
In file included from include/linux/spi/spi.h:15:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
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'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from drivers/gpu/drm/drm_mipi_dbi.c:13:
In file included from include/linux/spi/spi.h:15:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
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'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from drivers/gpu/drm/drm_mipi_dbi.c:13:
In file included from include/linux/spi/spi.h:15:
In file included from include/linux/scatterlist.h:9:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
>> drivers/gpu/drm/drm_mipi_dbi.c:77:17: warning: unused variable 'mipi_dbi_dcs_read_commands' [-Wunused-const-variable]
static const u8 mipi_dbi_dcs_read_commands[] = {
^
13 warnings generated.
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for DRM_DP_AUX_BUS
Depends on [n]: HAS_IOMEM [=y] && DRM [=y] && OF [=n]
Selected by [y]:
- DRM_MSM [=y] && HAS_IOMEM [=y] && DRM [=y] && (ARCH_QCOM || SOC_IMX5 || COMPILE_TEST [=y]) && COMMON_CLK [=y] && IOMMU_SUPPORT [=y] && (QCOM_OCMEM [=n] || QCOM_OCMEM [=n]=n) && (QCOM_LLCC [=y] || QCOM_LLCC [=y]=n) && (QCOM_COMMAND_DB [=n] || QCOM_COMMAND_DB [=n]=n)
vim +/mipi_dbi_dcs_read_commands +77 drivers/gpu/drm/drm_mipi_dbi.c
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 76
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 @77 static const u8 mipi_dbi_dcs_read_commands[] = {
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 78 MIPI_DCS_GET_DISPLAY_ID,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 79 MIPI_DCS_GET_RED_CHANNEL,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 80 MIPI_DCS_GET_GREEN_CHANNEL,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 81 MIPI_DCS_GET_BLUE_CHANNEL,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 82 MIPI_DCS_GET_DISPLAY_STATUS,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 83 MIPI_DCS_GET_POWER_MODE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 84 MIPI_DCS_GET_ADDRESS_MODE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 85 MIPI_DCS_GET_PIXEL_FORMAT,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 86 MIPI_DCS_GET_DISPLAY_MODE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 87 MIPI_DCS_GET_SIGNAL_MODE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 88 MIPI_DCS_GET_DIAGNOSTIC_RESULT,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 89 MIPI_DCS_READ_MEMORY_START,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 90 MIPI_DCS_READ_MEMORY_CONTINUE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 91 MIPI_DCS_GET_SCANLINE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 92 MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 93 MIPI_DCS_GET_CONTROL_DISPLAY,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 94 MIPI_DCS_GET_POWER_SAVE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 95 MIPI_DCS_GET_CABC_MIN_BRIGHTNESS,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 96 MIPI_DCS_READ_DDB_START,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 97 MIPI_DCS_READ_DDB_CONTINUE,
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 98 0, /* sentinel */
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 99 };
02dd95fe3169362 drivers/gpu/drm/tinydrm/mipi-dbi.c Noralf Trønnes 2017-01-22 100
:::::: The code at line 77 was first introduced by commit
:::::: 02dd95fe316936269a52d6ccb971bb956412b40a drm/tinydrm: Add MIPI DBI support
:::::: TO: Noralf Trønnes <noralf@xxxxxxxxxxx>
:::::: CC: Noralf Trønnes <noralf@xxxxxxxxxxx>
--
0-DAY CI Kernel Test Service
https://01.org/lkp