linux-kernel - arch/arm64/kvm/hyp/vhe/switch.c:217:17: warning: no previous prototype for function 'hyp

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Date:   Sun, 15 Aug 2021 06:06:43 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andrew Scull <ascull@...gle.com>
Cc:     clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, Marc Zyngier <maz@...nel.org>
Subject: arch/arm64/kvm/hyp/vhe/switch.c:217:17: warning: no previous
 prototype for function 'hyp_panic'

Hi Andrew,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ba31f97d43be41ca99ab72a6131d7c226306865f
commit: f79e616f27ab6cd74deb0995a8eead3d1c9d65af KVM: arm64: Use BUG and BUG_ON in nVHE hyp
date:   5 months ago
config: arm64-randconfig-r024-20210814 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1f7b25ea76a925aca690da28de9d78db7ca99d0c)
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f79e616f27ab6cd74deb0995a8eead3d1c9d65af
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout f79e616f27ab6cd74deb0995a8eead3d1c9d65af
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>):

>> arch/arm64/kvm/hyp/vhe/switch.c:217:17: warning: no previous prototype for function 'hyp_panic' [-Wmissing-prototypes]
   void __noreturn hyp_panic(void)
                   ^
   arch/arm64/kvm/hyp/vhe/switch.c:217:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __noreturn hyp_panic(void)
   ^
   static 
   arch/arm64/kvm/hyp/vhe/switch.c:227:17: warning: no previous prototype for function 'kvm_unexpected_el2_exception' [-Wmissing-prototypes]
   asmlinkage void kvm_unexpected_el2_exception(void)
                   ^
   arch/arm64/kvm/hyp/vhe/switch.c:227:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void kvm_unexpected_el2_exception(void)
              ^
              static 
   2 warnings generated.
--
>> arch/arm64/kvm/hyp/nvhe/switch.c:264:17: warning: no previous prototype for function 'hyp_panic' [-Wmissing-prototypes]
   void __noreturn hyp_panic(void)
                   ^
   arch/arm64/kvm/hyp/nvhe/switch.c:264:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __noreturn hyp_panic(void)
   ^
   static 
   arch/arm64/kvm/hyp/nvhe/switch.c:286:17: warning: no previous prototype for function 'kvm_unexpected_el2_exception' [-Wmissing-prototypes]
   asmlinkage void kvm_unexpected_el2_exception(void)
                   ^
   arch/arm64/kvm/hyp/nvhe/switch.c:286:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void kvm_unexpected_el2_exception(void)
              ^
              static 
   2 warnings generated.


vim +/hyp_panic +217 arch/arm64/kvm/hyp/vhe/switch.c

09cf57eba30424 David Brazdil 2020-06-25  216  
6a0259ed29bba8 Andrew Scull  2020-09-15 @217  void __noreturn hyp_panic(void)
09cf57eba30424 David Brazdil 2020-06-25  218  {
09cf57eba30424 David Brazdil 2020-06-25  219  	u64 spsr = read_sysreg_el2(SYS_SPSR);
09cf57eba30424 David Brazdil 2020-06-25  220  	u64 elr = read_sysreg_el2(SYS_ELR);
96d389ca10110d Rob Herring   2020-10-28  221  	u64 par = read_sysreg_par();
09cf57eba30424 David Brazdil 2020-06-25  222  
6a0259ed29bba8 Andrew Scull  2020-09-15  223  	__hyp_call_panic(spsr, elr, par);
09cf57eba30424 David Brazdil 2020-06-25  224  	unreachable();
09cf57eba30424 David Brazdil 2020-06-25  225  }
e9ee186bb735bf James Morse   2020-08-21  226  

:::::: The code at line 217 was first introduced by commit
:::::: 6a0259ed29bba83653a36fabcdf6b06aecd78596 KVM: arm64: Remove hyp_panic arguments

:::::: TO: Andrew Scull <ascull@...gle.com>
:::::: CC: Marc Zyngier <maz@...nel.org>

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

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