[ardb:arm64-compat-alignment-fixups 2/2] arch/arm64/kernel/compat_alignment.c:391:5: warning: no previous prototype for 'do_compat_alignment_fixup'

[kernel test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git arm64-compat-alignment-fixups
head:   16de979d9372710aaa42cd93d3af1e9a43d53369
commit: 16de979d9372710aaa42cd93d3af1e9a43d53369 [2/2] arm64: compat: Implement misalignment fixups for multiword loads
config: arm64-allyesconfig (https://download.01.org/0day-ci/archive/20220624/202206240300.IJJqMAVn-lkp@xxxxxxxxx/config)
compiler: aarch64-linux-gcc (GCC) 11.3.0
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/ardb/linux.git/commit/?id=16de979d9372710aaa42cd93d3af1e9a43d53369
        git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git
        git fetch --no-tags ardb arm64-compat-alignment-fixups
        git checkout 16de979d9372710aaa42cd93d3af1e9a43d53369
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> arch/arm64/kernel/compat_alignment.c:391:5: warning: no previous prototype for 'do_compat_alignment_fixup' [-Wmissing-prototypes]
     391 | int do_compat_alignment_fixup(unsigned long addr, struct pt_regs *regs)
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~


vim +/do_compat_alignment_fixup +391 arch/arm64/kernel/compat_alignment.c

   390	
 > 391	int do_compat_alignment_fixup(unsigned long addr, struct pt_regs *regs)

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