Re: [PATCH 13/13] fs: move binfmt_misc sysctl to its own file

[Xiaoming Ni <nixiaoming@huawei.com>]

On 2020/5/29 15:41, Luis Chamberlain wrote:
> This moves the binfmt_misc sysctl to its own file to help remove
> clutter from kernel/sysctl.c.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
> ---
>   fs/binfmt_misc.c | 1 +
>   kernel/sysctl.c  | 7 -------
>   2 files changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
> index f69a043f562b..656b3f5f3bbf 100644
> --- a/fs/binfmt_misc.c
> +++ b/fs/binfmt_misc.c
> @@ -821,6 +821,7 @@ static int __init init_misc_binfmt(void)
>   	int err = register_filesystem(&bm_fs_type);
>   	if (!err)
>   		insert_binfmt(&misc_format);
> +	register_sysctl_empty_subdir("fs", "binfmt_misc");
>   	return err;
>   }
build error when CONFIG_BINFMT_MISC=m

ERROR: modpost: "register_sysctl_empty_subdir" [fs/binfmt_misc.ko] 
undefined!

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 27f0c9ea..4129dfb 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2853,6 +2853,7 @@ void register_sysctl_empty_subdir(const char *base,
  {
         register_sysctl_subdir(base, subdir, sysctl_mount_point);
  }
+EXPORT_SYMBOL_GPL(register_sysctl_empty_subdir);
  #endif /* CONFIG_SYSCTL */


Thanks
Xiaoming Ni