linux-kernel - Re: [PATCH] debugfs: Fix !DEBUG_FS debugfs_create

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Date:   Thu, 21 Nov 2019 18:53:39 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Kusanagi Kouichi <slash@...auone-net.jp>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] debugfs: Fix !DEBUG_FS debugfs_create_automount

On Thu, 21 Nov 2019 19:20:21 +0900
Kusanagi Kouichi <slash@...auone-net.jp> wrote:

> If DEBUG_FS=n, compile fails with the following error:
> 
> kernel/trace/trace.c: In function 'tracing_init_dentry':
> kernel/trace/trace.c:8658:9: error: passing argument 3 of 'debugfs_create_automount' from incompatible pointer type [-Werror=incompatible-pointer-types]
>  8658 |         trace_automount, NULL);
>       |         ^~~~~~~~~~~~~~~
>       |         |
>       |         struct vfsmount * (*)(struct dentry *, void *)
> In file included from kernel/trace/trace.c:24:
> ./include/linux/debugfs.h:206:25: note: expected 'struct vfsmount * (*)(void *)' but argument is of type 'struct vfsmount * (*)(struct dentry *, void *)'
>   206 |      struct vfsmount *(*f)(void *),
>       |      ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
> 

Please add the tag:

 Reported-by: kbuild test robot <lkp@...el.com>

You can also add:

 Link: https://lore.kernel.org/lkml/201911211354.zYtbB4MD%25lkp@intel.com/

-- Steve

> Signed-off-by: Kusanagi Kouichi <slash@...auone-net.jp>
> ---
>  include/linux/debugfs.h | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
> index 58424eb3b329..798f0b9b43ae 100644
> --- a/include/linux/debugfs.h
> +++ b/include/linux/debugfs.h
> @@ -54,6 +54,8 @@ static const struct file_operations __fops = {				\
>  	.llseek  = no_llseek,						\
>  }
>  
> +typedef struct vfsmount *(*debugfs_automount_t)(struct dentry *, void *);
> +
>  #if defined(CONFIG_DEBUG_FS)
>  
>  struct dentry *debugfs_lookup(const char *name, struct dentry *parent);
> @@ -75,7 +77,6 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent);
>  struct dentry *debugfs_create_symlink(const char *name, struct dentry *parent,
>  				      const char *dest);
>  
> -typedef struct vfsmount *(*debugfs_automount_t)(struct dentry *, void *);
>  struct dentry *debugfs_create_automount(const char *name,
>  					struct dentry *parent,
>  					debugfs_automount_t f,
> @@ -203,7 +204,7 @@ static inline struct dentry *debugfs_create_symlink(const char *name,
>  
>  static inline struct dentry *debugfs_create_automount(const char *name,
>  					struct dentry *parent,
> -					struct vfsmount *(*f)(void *),
> +					debugfs_automount_t f,
>  					void *data)
>  {
>  	return ERR_PTR(-ENODEV);