arch/riscv/kernel/traps.c:405:1: sparse: sparse: symbol '__pcpu_scope_overflow_stack' was not declared. Should it be static?

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7475e51b87969e01a6812eac713a1c8310372e8a
commit: be97d0db5f44c0674480cb79ac6f5b0529b84c76 riscv: VMAP_STACK overflow detection thread-safe
date:   3 weeks ago
config: riscv-randconfig-r131-20231117 (https://download.01.org/0day-ci/archive/20231117/202311170738.xXn02awd-lkp@xxxxxxxxx/config)
compiler: riscv64-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231117/202311170738.xXn02awd-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311170738.xXn02awd-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
   WARNING: invalid argument to '-march': '_zihintpause'
>> arch/riscv/kernel/traps.c:405:1: sparse: sparse: symbol '__pcpu_scope_overflow_stack' was not declared. Should it be static?

vim +/__pcpu_scope_overflow_stack +405 arch/riscv/kernel/traps.c

   403	
   404	#ifdef CONFIG_VMAP_STACK
 > 405	DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)],
   406			overflow_stack)__aligned(16);
   407	

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