[ammarfaizi2-block:palmer/linux/vdso-fix-v3 9/9] arch/riscv/kernel/vdso.c:26:27: warning: tentative definition of variable with internal linkage has incomplete non-array type 'struct __vdso_info'

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block palmer/linux/vdso-fix-v3
head:   fcbe4db4bf998e22fc7a35a2e02f6ba3d5ffb5db
commit: fcbe4db4bf998e22fc7a35a2e02f6ba3d5ffb5db [9/9] WIP: riscv: vdso: fix NULL deference in vdso_join_timens() when vfork
config: riscv-randconfig-r022-20220916 (https://download.01.org/0day-ci/archive/20220916/202209162203.LQxeIrqT-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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/ammarfaizi2/linux-block/commit/fcbe4db4bf998e22fc7a35a2e02f6ba3d5ffb5db
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block palmer/linux/vdso-fix-v3
        git checkout fcbe4db4bf998e22fc7a35a2e02f6ba3d5ffb5db
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/ drivers/char/pcmcia/

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/riscv/kernel/vdso.c:26:27: warning: tentative definition of variable with internal linkage has incomplete non-array type 'struct __vdso_info' [-Wtentative-definition-incomplete-type]
   static struct __vdso_info vdso_info;
                             ^
   arch/riscv/kernel/vdso.c:26:15: note: forward declaration of 'struct __vdso_info'
   static struct __vdso_info vdso_info;
                 ^
   arch/riscv/kernel/vdso.c:29:27: warning: tentative definition of variable with internal linkage has incomplete non-array type 'struct __vdso_info' [-Wtentative-definition-incomplete-type]
   static struct __vdso_info compat_vdso_info;
                             ^
   arch/riscv/kernel/vdso.c:26:15: note: forward declaration of 'struct __vdso_info'
   static struct __vdso_info vdso_info;
                 ^
   2 warnings generated.


vim +26 arch/riscv/kernel/vdso.c

    24	
    25	extern char vdso_start[], vdso_end[];
  > 26	static struct __vdso_info vdso_info;
    27	#ifdef CONFIG_COMPAT
    28	extern char compat_vdso_start[], compat_vdso_end[];
    29	static struct __vdso_info compat_vdso_info;
    30	#endif
    31	

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