Re: [RFC PATCH] riscv: add VMAP_STACK overflow detection

[kernel test robot <lkp@intel.com>]

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Hi Tong,

[FYI, it's a private test report for your RFC patch.]
[auto build test WARNING on v5.12]
[also build test WARNING on next-20210507]
[cannot apply to linus/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Tong-Tiangen/riscv-add-VMAP_STACK-overflow-detection/20210507-171736
base:    9f4ad9e425a1d3b6a34617b8ea226d56a119a717
config: riscv-randconfig-r015-20210507 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a3a8a1a15b524d91b5308db68e9d293b34cd88dd)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/0day-ci/linux/commit/60d8a3da002bf59ec0abeb88403dbb11cf31583f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Tong-Tiangen/riscv-add-VMAP_STACK-overflow-detection/20210507-171736
        git checkout 60d8a3da002bf59ec0abeb88403dbb11cf31583f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/riscv/kernel/traps.c:212:26: warning: no previous prototype for function 'get_overflow_stack' [-Wmissing-prototypes]
   asmlinkage unsigned long get_overflow_stack(void)
                            ^
   arch/riscv/kernel/traps.c:212:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage unsigned long get_overflow_stack(void)
              ^
              static 
>> arch/riscv/kernel/traps.c:218:17: warning: no previous prototype for function 'handle_bad_stack' [-Wmissing-prototypes]
   asmlinkage void handle_bad_stack(struct pt_regs *regs)
                   ^
   arch/riscv/kernel/traps.c:218:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void handle_bad_stack(struct pt_regs *regs)
              ^
              static 
   2 warnings generated.


vim +/get_overflow_stack +212 arch/riscv/kernel/traps.c

   203	
   204	#ifdef CONFIG_VMAP_STACK
   205	DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack)
   206			__aligned(16);
   207	/*
   208	 * shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used
   209	 * to get per-cpu overflow stack(get_overflow_stack).
   210	 */
   211	long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)];
 > 212	asmlinkage unsigned long get_overflow_stack(void)
   213	{
   214		return (unsigned long)this_cpu_ptr(overflow_stack) +
   215			OVERFLOW_STACK_SIZE;
   216	}
   217	
 > 218	asmlinkage void handle_bad_stack(struct pt_regs *regs)

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

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