[PATCH 16/18] bpf-preload: Do kernel mount to ensure that pinned objects don't disappear

[kernel test robot]

Hi Roberto,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]
[also build test ERROR on linus/master next-20220328]
[cannot apply to bpf/master v5.17]
[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/intel-lab-lkp/linux/commits/Roberto-Sassu/bpf-Secure-and-authenticated-preloading-of-eBPF-programs/20220329-015829
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: riscv-randconfig-c004-20220327 (https://download.01.org/0day-ci/archive/20220329/202203291034.vCkMuZo5-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 11.2.0
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/eddbb1ec1e92ba00c4acc9f123769265e17e8e40
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Roberto-Sassu/bpf-Secure-and-authenticated-preloading-of-eBPF-programs/20220329-015829
        git checkout eddbb1ec1e92ba00c4acc9f123769265e17e8e40
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=riscv SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   kernel/bpf/inode.c:25:37: error: 'CONFIG_BPF_PRELOAD_LIST' undeclared here (not in a function)
      25 | static char *bpf_preload_list_str = CONFIG_BPF_PRELOAD_LIST;
         |                                     ^~~~~~~~~~~~~~~~~~~~~~~
>> kernel/bpf/inode.c:1026:13: error: redefinition of 'mount_bpffs'
    1026 | void __init mount_bpffs(void)
         |             ^~~~~~~~~~~
   In file included from include/linux/filter.h:9,
                    from kernel/bpf/inode.c:20:
   include/linux/bpf.h:1146:27: note: previous definition of 'mount_bpffs' with type 'void(void)'
    1146 | static inline void __init mount_bpffs(void)
         |                           ^~~~~~~~~~~


vim +/mount_bpffs +1026 kernel/bpf/inode.c

  1025	
> 1026	void __init mount_bpffs(void)

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https://01.org/lkp