linux-kernel - Re: [PATCH 2/2] binderfs: remove separate device

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Date:   Wed, 30 Jan 2019 15:24:12 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christian Brauner <christian@...uner.io>
Cc:     tkjos@...roid.com, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, arve@...roid.com, maco@...roid.com,
        joel@...lfernandes.org, tkjos@...gle.com
Subject: Re: [PATCH 2/2] binderfs: remove separate device_initcall()

On Wed, Jan 23, 2019 at 12:41:16PM +0100, Christian Brauner wrote:
> binderfs should not have a separate device_initcall(). When a kernel is
> compiled with CONFIG_ANDROID_BINDERFS register the filesystem alongside
> CONFIG_ANDROID_IPC. This use-case is especially sensible when users specify
> CONFIG_ANDROID_IPC=y, CONFIG_ANDROID_BINDERFS=y and
> ANDROID_BINDER_DEVICES="".
> When CONFIG_ANDROID_BINDERFS=n then this always succeeds so there's no
> regression potential for legacy workloads.
> 
> Signed-off-by: Christian Brauner <christian@...uner.io>
> ---
>  drivers/android/binder.c          | 4 ++++
>  drivers/android/binder_internal.h | 9 +++++++++
>  drivers/android/binderfs.c        | 4 +---
>  3 files changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index cdfc87629efb..751d76173f81 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -5915,6 +5915,10 @@ static int __init binder_init(void)
>  			goto err_init_binder_device_failed;
>  	}
>  
> +	ret = init_binderfs();
> +	if (ret)
> +		goto err_init_binder_device_failed;
> +
>  	return ret;
>  
>  err_init_binder_device_failed:
> diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
> index 7fb97f503ef2..045b3e42d98b 100644
> --- a/drivers/android/binder_internal.h
> +++ b/drivers/android/binder_internal.h
> @@ -46,4 +46,13 @@ static inline bool is_binderfs_device(const struct inode *inode)
>  }
>  #endif
>  
> +#ifdef CONFIG_ANDROID_BINDERFS
> +extern int __init init_binderfs(void);
> +#else
> +static inline int __init init_binderfs(void)
> +{
> +	return 0;
> +}
> +#endif
> +
>  #endif /* _LINUX_BINDER_INTERNAL_H */
> diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
> index 7a550104a722..e773f45d19d9 100644
> --- a/drivers/android/binderfs.c
> +++ b/drivers/android/binderfs.c
> @@ -550,7 +550,7 @@ static struct file_system_type binder_fs_type = {
>  	.fs_flags	= FS_USERNS_MOUNT,
>  };
>  
> -static int __init init_binderfs(void)
> +int __init init_binderfs(void)
>  {
>  	int ret;
>  
> @@ -568,5 +568,3 @@ static int __init init_binderfs(void)
>  
>  	return ret;
>  }
> -
> -device_initcall(init_binderfs);

I get a build warning when applying this patch :(

Please fix up and resend.

thanks,

greg k-h