tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y head: 7457eed4b647560ae1b1800c295efc5f1db22e4b commit: 7aaf09fd5c63ee9dc86325896abdfa47c54d39a9 [1159/1498] kbuild: support LLVM=1 to switch the default tools to Clang/LLVM config: hexagon-randconfig-r041-20210827 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1076082a0d97bd5c16a25ee7cf3dbb6ee4b5a9fe) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=7aaf09fd5c63ee9dc86325896abdfa47c54d39a9 git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.19.y git checkout 7aaf09fd5c63ee9dc86325896abdfa47c54d39a9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:180:6: warning: variable 'value' set but not used [-Wunused-but-set-variable] u32 value = readl(ioaddr + MTL_OPERATION_MODE); ^ 1 warning generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for FRAME_POINTER Depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS Selected by - LOCKDEP && DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT && !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE && !ARC && !X86 vim +/value +180 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 175 d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 176 static void dwmac4_prog_mtl_tx_algorithms(struct mac_device_info *hw, d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 177 u32 tx_alg) d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 178 { d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 179 void __iomem *ioaddr = hw->pcsr; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 @180 u32 value = readl(ioaddr + MTL_OPERATION_MODE); d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 181 d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 182 value &= ~MTL_OPERATION_SCHALG_MASK; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 183 switch (tx_alg) { d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 184 case MTL_TX_ALGORITHM_WRR: d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 185 value |= MTL_OPERATION_SCHALG_WRR; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 186 break; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 187 case MTL_TX_ALGORITHM_WFQ: d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 188 value |= MTL_OPERATION_SCHALG_WFQ; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 189 break; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 190 case MTL_TX_ALGORITHM_DWRR: d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 191 value |= MTL_OPERATION_SCHALG_DWRR; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 192 break; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 193 case MTL_TX_ALGORITHM_SP: d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 194 value |= MTL_OPERATION_SCHALG_SP; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 195 break; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 196 default: d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 197 break; d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 198 } d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 199 } d0a9c9f9c6d0b1 Joao Pinto 2017-03-10 200 :::::: The code at line 180 was first introduced by commit :::::: d0a9c9f9c6d0b1f0773e0aba5ab519b8ddc87a7a net: stmmac: configure mtl rx and tx algorithms :::::: TO: Joao Pinto :::::: CC: David S. Miller --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org