linux-kernel - [atishp04:unmatched_pmu 1/4] drivers/perf/riscv_pmu_sbi.c:709:34: warning: shift count >= width of type

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Date:   Wed, 25 May 2022 00:54:57 +0800
From:   kernel test robot <lkp@...el.com>
To:     João Mário Domingos 
        <joao.mario@...nico.ulisboa.pt>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Atish Patra <Atish.Patra@....com>,
        linux-kernel@...r.kernel.org, Atish Patra <atishp@...osinc.com>
Subject: [atishp04:unmatched_pmu 1/4] drivers/perf/riscv_pmu_sbi.c:709:34:
 warning: shift count >= width of type

tree:   https://github.com/atishp04/linux unmatched_pmu
head:   7b75dbb7c4c01dceb7a974c352945fd86eb88c25
commit: 04bc56e83a7e6e851694e34da95f26c57abc7132 [1/4] RISC-V: Create unique identification for SoC PMU
config: riscv-rv32_defconfig (https://download.01.org/0day-ci/archive/20220525/202205250058.7LPnhB6e-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 10c9ecce9f6096e18222a331c5e7d085bd813f75)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/atishp04/linux/commit/04bc56e83a7e6e851694e34da95f26c57abc7132
        git remote add atishp04 https://github.com/atishp04/linux
        git fetch --no-tags atishp04 unmatched_pmu
        git checkout 04bc56e83a7e6e851694e34da95f26c57abc7132
        # 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=riscv SHELL=/bin/bash drivers/perf/

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

All warnings (new ones prefixed by >>):

>> drivers/perf/riscv_pmu_sbi.c:709:34: warning: shift count >= width of type [-Wshift-count-overflow]
           pmuid.arch = (sbi_get_marchid() >> (63 - 15) & (1 << 15)) | (sbi_get_marchid() & 0x7FFF);
                                           ^  ~~~~~~~~~
   1 warning generated.


vim +709 drivers/perf/riscv_pmu_sbi.c

   695	
   696	static uint64_t pmu_sbi_get_pmu_id(void)
   697	{
   698		union sbi_pmu_id {
   699			uint64_t value;
   700			struct {
   701				uint16_t imp:16;
   702				uint16_t arch:16;
   703				uint32_t vendor:32;
   704			};
   705		} pmuid;
   706	
   707		pmuid.value = 0;
   708		pmuid.vendor = (uint32_t) sbi_get_mvendorid();
 > 709		pmuid.arch = (sbi_get_marchid() >> (63 - 15) & (1 << 15)) | (sbi_get_marchid() & 0x7FFF);
   710		pmuid.imp = (sbi_get_mimpid() >> 16);
   711	
   712		return pmuid.value;
   713	}
   714	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp