[PATCH] vdso: fix NULL deference in vdso_join_timens() when vfork

[kernel test robot]

Hi Jisheng,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.0-rc4]
[cannot apply to next-20220907]
[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/Jisheng-Zhang/vdso-fix-NULL-deference-in-vdso_join_timens-when-vfork/20220908-011001
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0066f1b0e27556381402db3ff31f85d2a2265858
config: riscv-randconfig-r006-20220907 (https://download.01.org/0day-ci/archive/20220908/202209080625.DOtyS4G0-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 12.1.0
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://github.com/intel-lab-lkp/linux/commit/247635b442c42937dc9f0c0a04711fb3f86df2a9
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jisheng-Zhang/vdso-fix-NULL-deference-in-vdso_join_timens-when-vfork/20220908-011001
        git checkout 247635b442c42937dc9f0c0a04711fb3f86df2a9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

>> arch/riscv/kernel/vdso.c:158:24: error: 'rv_compat_vdso_maps' undeclared here (not in a function); did you mean 'rv_vdso_maps'?
     158 |                 .dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR],
         |                        ^~~~~~~~~~~~~~~~~~~
         |                        rv_vdso_maps
   arch/riscv/kernel/vdso.c:165:34: warning: 'rv_compat_vdso_maps' defined but not used [-Wunused-variable]
     165 | static struct vm_special_mapping rv_compat_vdso_maps[] __ro_after_init = {
         |                                  ^~~~~~~~~~~~~~~~~~~


vim +158 arch/riscv/kernel/vdso.c

   144	
   145	static struct __vdso_info vdso_info[] __ro_after_init = {
   146		[VDSO_ABI_RV64] = {
   147			.name = "vdso",
   148			.vdso_code_start = vdso_start,
   149			.vdso_code_end = vdso_end,
   150			.dm = &rv_vdso_maps[RV_VDSO_MAP_VVAR],
   151			.cm = &rv_vdso_maps[RV_VDSO_MAP_VDSO],
   152		},
   153	#ifdef CONFIG_COMPAT
   154		[VDSO_ABI_RV32] = {
   155			.name = "compat_vdso",
   156			.vdso_code_start = compat_vdso_start,
   157			.vdso_code_end = compat_vdso_end,
 > 158			.dm = &rv_compat_vdso_maps[RV_VDSO_MAP_VVAR],
   159			.cm = &rv_compat_vdso_maps[RV_VDSO_MAP_VDSO],
   160		},
   161	#endif
   162	};
   163	

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