[PATCH v4 16/30] riscv/shstk: If needed allocate a new shadow stack on clone

[kernel test robot]

Hi Deepak,

kernel test robot noticed the following build errors:

[auto build test ERROR on shuah-kselftest/next]
[also build test ERROR on shuah-kselftest/fixes tip/x86/core robh/for-next arnd-asm-generic/master tip/smp/core kees/for-next/execve linus/master v6.11-rc7]
[cannot apply to akpm-mm/mm-everything next-20240913]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Deepak-Gupta/mm-Introduce-ARCH_HAS_USER_SHADOW_STACK/20240913-072124
base:   https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git next
patch link:    https://lore.kernel.org/r/20240912231650.3740732-17-debug%40rivosinc.com
patch subject: [PATCH v4 16/30] riscv/shstk: If needed allocate a new shadow stack on clone
config: riscv-randconfig-001-20240914 (https://download.01.org/0day-ci/archive/20240914/202409141059.SDUgpQw4-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240914/202409141059.SDUgpQw4-lkp@intel.com/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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409141059.SDUgpQw4-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

>> clang diag: arch/riscv/include/asm/usercfi.h:44:15: warning: no previous prototype for function 'get_shstk_base' [-Wmissing-prototypes]
--
   In file included from drivers/gpu/drm/drm_plane.c:23:
   In file included from include/linux/slab.h:16:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:56:
   In file included from include/linux/preempt.h:79:
   In file included from ./arch/riscv/include/generated/asm/preempt.h:1:
   In file included from include/asm-generic/preempt.h:5:
   In file included from include/linux/thread_info.h:60:
   In file included from arch/riscv/include/asm/thread_info.h:37:
   In file included from arch/riscv/include/asm/processor.h:17:
>> arch/riscv/include/asm/usercfi.h:44:15: error: no previous prototype for function 'get_shstk_base' [-Werror,-Wmissing-prototypes]
   unsigned long get_shstk_base(struct task_struct *task, unsigned long *size)
                 ^
   arch/riscv/include/asm/usercfi.h:44:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned long get_shstk_base(struct task_struct *task, unsigned long *size)
   ^
   static 
   1 error generated.
--
   In file included from arch/riscv/kernel/asm-offsets.c:10:
   In file included from include/linux/mm.h:7:
   In file included from include/linux/gfp.h:7:
   In file included from include/linux/mmzone.h:8:
   In file included from include/linux/spinlock.h:56:
   In file included from include/linux/preempt.h:79:
   In file included from ./arch/riscv/include/generated/asm/preempt.h:1:
   In file included from include/asm-generic/preempt.h:5:
   In file included from include/linux/thread_info.h:60:
   In file included from arch/riscv/include/asm/thread_info.h:37:
   In file included from arch/riscv/include/asm/processor.h:17:
   arch/riscv/include/asm/usercfi.h:44:15: warning: no previous prototype for function 'get_shstk_base' [-Wmissing-prototypes]
   unsigned long get_shstk_base(struct task_struct *task, unsigned long *size)
                 ^
   arch/riscv/include/asm/usercfi.h:44:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned long get_shstk_base(struct task_struct *task, unsigned long *size)
   ^
   static 
   1 warning generated.
>> clang diag: arch/riscv/include/asm/usercfi.h:44:15: warning: no previous prototype for function 'get_shstk_base' [-Wmissing-prototypes]
>> clang diag: arch/riscv/include/asm/usercfi.h:44:15: warning: no previous prototype for function 'get_shstk_base' [-Wmissing-prototypes]


vim +/get_shstk_base +44 arch/riscv/include/asm/usercfi.h

    43	
  > 44	unsigned long get_shstk_base(struct task_struct *task, unsigned long *size)
    45	{
    46		return 0;
    47	}
    48	

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