linux-kernel - [intel-tdx:kvm-upstream 24/152] arch/x86/kernel/cpu/tsx.c:186:5: warning: no previous prototype for function 'tsx_ctrl

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Date:   Thu, 16 Dec 2021 18:59:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     Isaku Yamahata <isaku.yamahata@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Chenyi Qiang <chenyi.qiang@...el.com>
Subject: [intel-tdx:kvm-upstream 24/152] arch/x86/kernel/cpu/tsx.c:186:5:
 warning: no previous prototype for function 'tsx_ctrl_clear'

tree:   https://github.com/intel/tdx.git kvm-upstream
head:   bdfe06c17daab60c196ff80c1d98467a1d3734fa
commit: 66d36f53706ca091e0362a29d87a91813265e589 [24/152] x86/cpu/tsx: Add helper functions to save/restore IA32_TSX_CTRL MSR
config: i386-randconfig-r012-20211216 (https://download.01.org/0day-ci/archive/20211216/202112161842.loPyrD9m-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dd245bab9fbb364faa1581e4f92ba3119a872fba)
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/66d36f53706ca091e0362a29d87a91813265e589
        git remote add intel-tdx https://github.com/intel/tdx.git
        git fetch --no-tags intel-tdx kvm-upstream
        git checkout 66d36f53706ca091e0362a29d87a91813265e589
        # 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=i386 SHELL=/bin/bash arch/x86/kernel/cpu/

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/tsx.c:186:5: warning: no previous prototype for function 'tsx_ctrl_clear' [-Wmissing-prototypes]
   u64 tsx_ctrl_clear(void)
       ^
   arch/x86/kernel/cpu/tsx.c:186:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   u64 tsx_ctrl_clear(void)
   ^
   static 
>> arch/x86/kernel/cpu/tsx.c:199:6: warning: no previous prototype for function 'tsx_ctrl_restore' [-Wmissing-prototypes]
   void tsx_ctrl_restore(u64 tsx_ctrl)
        ^
   arch/x86/kernel/cpu/tsx.c:199:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void tsx_ctrl_restore(u64 tsx_ctrl)
   ^
   static 
   2 warnings generated.


vim +/tsx_ctrl_clear +186 arch/x86/kernel/cpu/tsx.c

   184	
   185	/* Clear the MSR_TSX_CTRL and return the old value if supported */
 > 186	u64 tsx_ctrl_clear(void)
   187	{
   188		u64 tsx_ctrl = 0;
   189	
   190		if (ia32_tsx_ctrl_supported) {
   191			rdmsrl(MSR_IA32_TSX_CTRL, tsx_ctrl);
   192			if (tsx_ctrl & MSR_TSX_CTRL_MASK)
   193				wrmsrl(MSR_IA32_TSX_CTRL, tsx_ctrl & ~MSR_TSX_CTRL_MASK);
   194		}
   195		return tsx_ctrl;
   196	}
   197	EXPORT_SYMBOL_GPL(tsx_ctrl_clear);
   198	
 > 199	void tsx_ctrl_restore(u64 tsx_ctrl)

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