Re: [PATCH v2] char: misc: add missing #ifdef CONFIG_PROC_FS

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Jul 30, 2024 at 04:03:12PM +0800, zhangjiao2 wrote:
> From: Zhang Jiao <zhangjiao2@cmss.chinamobile.com>
> 
> Since misc_seq_ops is defined under CONFIG_PROC_FS in this file,
> it also need under CONFIG_PROC_FS when use. 
> 
> v1->v2: not check proc_creat_seq returns

As per the documentation, this goes below the --- line.

> 
> Signed-off-by: Zhang Jiao <zhangjiao2@cmss.chinamobile.com>
> ---
>  drivers/char/misc.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/char/misc.c b/drivers/char/misc.c
> index 541edc26ec89..e1e8cd09c34a 100644
> --- a/drivers/char/misc.c
> +++ b/drivers/char/misc.c
> @@ -286,9 +286,11 @@ EXPORT_SYMBOL(misc_deregister);
>  static int __init misc_init(void)
>  {
>  	int err;
> +#ifdef CONFIG_PROC_FS

Again, why is a #ifdef ok in this .c file?  What changed to suddenly
require this?

thanks,

greg k-h