linux-kernel - [morse:mpam/snapshot/v5.15 119/139] arch/arm64/include/asm/mpam.h:110:6: warning: variable 'regval' set but not used

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Message-ID: <202111251807.ljdrXC4V-lkp@intel.com>
Date:   Thu, 25 Nov 2021 18:30:33 +0800
From:   kernel test robot <lkp@...el.com>
To:     James Morse <james.morse@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [morse:mpam/snapshot/v5.15 119/139]
 arch/arm64/include/asm/mpam.h:110:6: warning: variable 'regval' set but not
 used

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v5.15
head:   ce3629841262f725a5f3a327403fcaf0e604a85e
commit: ec95ea0172936108af0216efb0e4f28402eaf1c6 [119/139] arm64: mpam: Add helpers to change a tasks and cpu mpam partid/pmg values
config: arm64-randconfig-r012-20211115 (https://download.01.org/0day-ci/archive/20211125/202111251807.ljdrXC4V-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/commit/?id=ec95ea0172936108af0216efb0e4f28402eaf1c6
        git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
        git fetch --no-tags morse mpam/snapshot/v5.15
        git checkout ec95ea0172936108af0216efb0e4f28402eaf1c6
        # save the config file to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from arch/arm64/kernel/process.c:51:
>> arch/arm64/include/asm/mpam.h:110:6: warning: variable 'regval' set but not used [-Wunused-but-set-variable]
           u64 regval;
               ^
   arch/arm64/include/asm/mpam.h:133:6: warning: variable 'regval' set but not used [-Wunused-but-set-variable]
           u64 regval = mpam_get_regval(tsk);
               ^
   2 warnings generated.


vim +/regval +110 arch/arm64/include/asm/mpam.h

   105	
   106	static inline void mpam_set_task_partid_pmg(struct task_struct *tsk,
   107						    u16 partid_d, u16 partid_i,
   108						    u8 pmg_d, u8 pmg_i)
   109	{
 > 110		u64 regval;
   111	
   112		regval = FIELD_PREP(MPAM_SYSREG_PARTID_D, partid_d);
   113		regval |= FIELD_PREP(MPAM_SYSREG_PARTID_I, partid_i);
   114		regval |= FIELD_PREP(MPAM_SYSREG_PMG_D, pmg_d);
   115		regval |= FIELD_PREP(MPAM_SYSREG_PMG_I, pmg_i);
   116	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org