[Please ignore if it is already reported]
Following build warnings/ errors noticed while building linux mainline master branch with clang-nightly, clang-13, clang-12, clang-11 and clang-10 for arm64 architecture. Whereas gcc-11 build pass.
# to reproduce this build locally: tuxmake --target-arch=arm64 --kconfig=defconfig --toolchain=clang-nightly --wrapper=none --environment=KBUILD_BUILD_TIMESTAMP=@1630870764 --environment=KBUILD_BUILD_USER=tuxmake --environment=KBUILD_BUILD_HOST=tuxmake --runtime=podman --image=855116176053.dkr.ecr.us-east-1.amazonaws.com/tuxmake/arm64_clang-nightly config default kernel xipkernel modules dtbs dtbs-legacy debugkernel headers make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/current ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- HOSTCC=clang CC=clang defconfig make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/current ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- HOSTCC=clang CC=clang scripts/dtc/include-prefixes/arm/bcm2711-rpi-4-b.dts:220.10-231.4: Warning (pci_device_reg): /scb/pcie@7d500000/pci@1,0: PCI unit address format error, expected 0,0 scripts/dtc/include-prefixes/arm/bcm2711-rpi-4-b.dts:220.10-231.4: Warning (pci_device_reg): /scb/pcie@7d500000/pci@1,0: PCI unit address format error, expected 0,0 arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi:464.3-52: Warning (pci_device_reg): /pcie@f8000000/pcie@0,0:reg: PCI reg address is not configuration space arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi:464.3-52: Warning (pci_device_reg): /pcie@f8000000/pcie@0,0:reg: PCI reg address is not configuration space arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi:464.3-52: Warning (pci_device_reg): /pcie@f8000000/pcie@0,0:reg: PCI reg address is not configuration space arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi:464.3-52: Warning (pci_device_reg): /pcie@f8000000/pcie@0,0:reg: PCI reg address is not configuration space arch/arm64/kvm/hyp/nvhe/Makefile:58: FORCE prerequisite is missing drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:157:11: error: variable 'err' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] else if (mlx5_esw_bridge_dev_same_hw(rep, esw)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:164:9: note: uninitialized use occurs here return err; ^~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:157:7: note: remove the 'if' if its condition is always true else if (mlx5_esw_bridge_dev_same_hw(rep, esw)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:140:9: note: initialize the variable 'err' to silence this warning int err; ^ = 0 drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:262:7: error: variable 'err' is used uninitialized whenever switch case is taken [-Werror,-Wsometimes-uninitialized] case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:276:9: note: uninitialized use occurs here return err; ^~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:257:7: error: variable 'err' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] if (attr->u.brport_flags.mask & ~(BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:276:9: note: uninitialized use occurs here return err; ^~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:257:3: note: remove the 'if' if its condition is always true if (attr->u.brport_flags.mask & ~(BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.c:247:9: note: initialize the variable 'err' to silence this warning int err; ^ = 0 3 errors generated. make[6]: *** [scripts/Makefile.build:277: drivers/net/ethernet/mellanox/mlx5/core/en/rep/bridge.o] Error 1 make[6]: Target '__build' not remade because of errors. make[5]: *** [scripts/Makefile.build:540: drivers/net/ethernet/mellanox/mlx5/core] Error 2 make[5]: Target '__build' not remade because of errors. make[4]: *** [scripts/Makefile.build:540: drivers/net/ethernet/mellanox] Error 2 make[4]: Target '__build' not remade because of errors. make[3]: *** [scripts/Makefile.build:540: drivers/net/ethernet] Error 2 make[3]: Target '__build' not remade because of errors. make[2]: *** [scripts/Makefile.build:540: drivers/net] Error 2 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1872: drivers] Error 2 make[1]: Target '__all' not remade because of errors. make: *** [Makefile:219: __sub-make] Error 2 make: Target '__all' not remade because of errors.
Build config: https://builds.tuxbuild.com/1xjZrnXEZfc3qYzziclNRaugAaN/config
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
meta data: ----------- git_describe: v5.14-9687-g27151f177827 git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline git_sha: 27151f177827d478508e756c7657273261aaf8a9 git_short_log: 27151f177827 (\Merge tag 'perf-tools-for-v5.15-2021-09-04' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux) kconfig: [ defconfig ], kernel_version: 5.14.0 status_message: failure while building tuxmake target(s): default target_arch: arm64 toolchain: clang-nightly, clang-13, clang-12, clang-11 and clang-10
steps to reproduce: https://builds.tuxbuild.com/1xjZrnXEZfc3qYzziclNRaugAaN/tuxmake_reproducer.s...
-- Linaro LKFT https://lkft.linaro.org