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Date:   Tue, 29 Dec 2020 18:32:14 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andrew Scull <ascull@...gle.com>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, Marc Zyngier <maz@...nel.org>
Subject: arch/arm64/kvm/hyp/nvhe/hyp-main.c:18:6: warning: no previous
 prototype for function 'handle_trap'

Hi Andrew,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dea8dcf2a9fa8cc540136a6cd885c3beece16ec3
commit: 4e3393a969a0bdaae83263918b6824b2d08c3996 KVM: arm64: nVHE: Switch to hyp context for EL2
date:   4 months ago
config: arm64-randconfig-r025-20201229 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project cee1e7d14f4628d6174b33640d502bff3b54ae45)
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/torvalds/linux.git/commit/?id=4e3393a969a0bdaae83263918b6824b2d08c3996
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4e3393a969a0bdaae83263918b6824b2d08c3996
        # 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/nvhe/hyp-main.c:18:6: warning: no previous prototype for function 'handle_trap' [-Wmissing-prototypes]
   void handle_trap(struct kvm_cpu_context *host_ctxt)
        ^
   arch/arm64/kvm/hyp/nvhe/hyp-main.c:18:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void handle_trap(struct kvm_cpu_context *host_ctxt)
   ^
   static 
   1 warning generated.


vim +/handle_trap +18 arch/arm64/kvm/hyp/nvhe/hyp-main.c

    14	
    15	typedef unsigned long (*hypcall_fn_t)
    16		(unsigned long, unsigned long, unsigned long);
    17	
  > 18	void handle_trap(struct kvm_cpu_context *host_ctxt)

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

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