linux-kernel - [intel-tdx:kvm-upstream-workaround 7/145] arch/x86/kernel/cpu/tdx/tdx.c:148:30: warning: variable 'err' is uninitialized when used within its own initialization

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Message-ID: <202202121324.DClhLKTq-lkp@intel.com>
Date:   Sat, 12 Feb 2022 13:45:24 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kai Huang <kai.huang@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Isaku Yamahata <isaku.yamahata@...el.com>
Subject: [intel-tdx:kvm-upstream-workaround 7/145]
 arch/x86/kernel/cpu/tdx/tdx.c:148:30: warning: variable 'err' is
 uninitialized when used within its own initialization

tree:   https://github.com/intel/tdx.git kvm-upstream-workaround
head:   f40698d38196025a38e79a2bdf22058de944b38a
commit: 474e0c5f940be499b7c8996ba8e64c31f56d21fe [7/145] x86/cpu: Do logical cpu level TDX module initialization
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220212/202202121324.DClhLKTq-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c7eb84634519e6497be42f5fe323f9a04ed67127)
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://github.com/intel/tdx/commit/474e0c5f940be499b7c8996ba8e64c31f56d21fe
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx kvm-upstream-workaround
        git checkout 474e0c5f940be499b7c8996ba8e64c31f56d21fe
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/cpu/tdx/ drivers/gpu/drm/i915/

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 >>):

>> arch/x86/kernel/cpu/tdx/tdx.c:148:30: warning: variable 'err' is uninitialized when used within its own initialization [-Wuninitialized]
           atomic_t *err = (atomic_t *)err;
                     ~~~               ^~~
   1 warning generated.


vim +/err +148 arch/x86/kernel/cpu/tdx/tdx.c

   144	
   145	/* SMP call function to run TDH.SYS.LP.INIT */
   146	static void smp_call_tdx_cpu_init(void *data)
   147	{
 > 148		atomic_t *err = (atomic_t *)err;
   149	
   150		if (tdh_sys_lp_init())
   151			atomic_set(err, -1);
   152	}
   153	

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