[bpf-next] bpf: Define bpf_token_show_fdinfo with CONFIG_PROC_FS

Commit Message

Tao Chen March 18, 2025, 6:25 a.m. UTC

Protect bpf_token_show_fdinfo with CONFIG_PROC_FS check, follow the
pattern used with other *_show_fdinfo functions.

Fixes: 35f96de04127 ("bpf: Introduce BPF token object")
Signed-off-by: Tao Chen <[e-mail]>
---
 kernel/bpf/token.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Jiri Olsa March 18, 2025, 9:28 a.m. UTC | #1

On Tue, Mar 18, 2025 at 02:25:57PM +0800, Tao Chen wrote:
> Protect bpf_token_show_fdinfo with CONFIG_PROC_FS check, follow the
> pattern used with other *_show_fdinfo functions.
> 
> Fixes: 35f96de04127 ("bpf: Introduce BPF token object")
> Signed-off-by: Tao Chen <[e-mail]>
> ---
>  kernel/bpf/token.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/kernel/bpf/token.c b/kernel/bpf/token.c
> index 26057aa13..104ca37e9 100644
> --- a/kernel/bpf/token.c
> +++ b/kernel/bpf/token.c
> @@ -65,6 +65,7 @@ static int bpf_token_release(struct inode *inode, struct file *filp)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PROC_FS
>  static void bpf_token_show_fdinfo(struct seq_file *m, struct file *filp)
>  {
>  	struct bpf_token *token = filp->private_data;
> @@ -98,6 +99,7 @@ static void bpf_token_show_fdinfo(struct seq_file *m, struct file *filp)
>  	else
>  		seq_printf(m, "allowed_attachs:\t0x%llx\n", token->allowed_attachs);
>  }
> +#endif
>  
>  #define BPF_TOKEN_INODE_NAME "bpf-token"
>  
> @@ -105,7 +107,9 @@ static const struct inode_operations bpf_token_iops = { };
>  
>  static const struct file_operations bpf_token_fops = {
>  	.release	= bpf_token_release,
> +#ifdef CONFIG_PROC_FS
>  	.show_fdinfo	= bpf_token_show_fdinfo,
> +#endif

there's many more of such cases.. I'm not sure if it makes sense to fix that,
because it does not break the build and only save space for !CONFIG_PROC_FS
kernels

jirka


>  };
>  
>  int bpf_token_create(union bpf_attr *attr)
> -- 
> 2.43.0
>

Patch

diff --git a/kernel/bpf/token.c b/kernel/bpf/token.c
index 26057aa13..104ca37e9 100644
--- a/kernel/bpf/token.c
+++ b/kernel/bpf/token.c
@@ -65,6 +65,7 @@  static int bpf_token_release(struct inode *inode, struct file *filp)
 	return 0;
 }
 
+#ifdef CONFIG_PROC_FS
 static void bpf_token_show_fdinfo(struct seq_file *m, struct file *filp)
 {
 	struct bpf_token *token = filp->private_data;
@@ -98,6 +99,7 @@  static void bpf_token_show_fdinfo(struct seq_file *m, struct file *filp)
 	else
 		seq_printf(m, "allowed_attachs:\t0x%llx\n", token->allowed_attachs);
 }
+#endif
 
 #define BPF_TOKEN_INODE_NAME "bpf-token"
 
@@ -105,7 +107,9 @@  static const struct inode_operations bpf_token_iops = { };
 
 static const struct file_operations bpf_token_fops = {
 	.release	= bpf_token_release,
+#ifdef CONFIG_PROC_FS
 	.show_fdinfo	= bpf_token_show_fdinfo,
+#endif
 };
 
 int bpf_token_create(union bpf_attr *attr)