linux-kernel - [morse:mpam/snapshot/v5.18 145/146] drivers/perf/resctrl_pmu.c:241:11: warning: variable 'id' is uninitialized when used within its own initialization

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Date:   Mon, 20 Jun 2022 11:15:38 +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/v5.18 145/146]
 drivers/perf/resctrl_pmu.c:241:11: warning: variable 'id' is uninitialized
 when used within its own initialization

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/snapshot/v5.18
head:   bac90d25cbdee0fc233b9b1c47d5b6f44101a384
commit: 03bff3df8a6f1e3120c7140d4c569bbb78d6e6d4 [145/146] drivers/perf: Add PMU to support reading resctrl counters via perf
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20220620/202206201130.h6t8Rjbz-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project af6d2a0b6825e71965f3e2701a63c239fa0ad70f)
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=03bff3df8a6f1e3120c7140d4c569bbb78d6e6d4
        git remote add morse https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
        git fetch --no-tags morse mpam/snapshot/v5.18
        git checkout 03bff3df8a6f1e3120c7140d4c569bbb78d6e6d4
        # 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=arm64 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/resctrl_pmu.c:241:11: warning: variable 'id' is uninitialized when used within its own initialization [-Wuninitialized]
           u64 id = id;
               ~~   ^~
   1 warning generated.


vim +/id +241 drivers/perf/resctrl_pmu.c

   232	
   233	/*
   234	 * Not all architetures do anything with resctrl_arch_mon_ctx_alloc_no_wait(),
   235	 * so hwc->idx may be meaningless.
   236	 */
   237	static int resctrl_pmu_event_idx(struct perf_event *event)
   238	{
   239		u16 event_num = get_event(event);
   240		u32 closid, rmid, idx;
 > 241		u64 id = id;
   242	
   243		__resctrl_id_decode(id, &closid, &rmid);
   244		idx = resctrl_arch_rmid_idx_encode(closid, rmid);
   245	
   246		return idx << ilog2(RESCTRL_MAX_EVENT_NUM) | event_num;
   247	}
   248	

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