linux-kernel - Re: [PATCH 4/5 v2] tracefs: Add directory /sys/kernel/tracing

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Message-ID: <20150124030056.GC5009@kroah.com>
Date:	Sat, 24 Jan 2015 11:00:56 +0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 4/5 v2] tracefs: Add directory /sys/kernel/tracing

On Fri, Jan 23, 2015 at 10:55:29AM -0500, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> When tracefs is configured, have the directory /sys/kernel/tracing appear
> just like /sys/kernel/debug appears when debugfs is configured.
> 
> This will give a consistent place for system admins to mount tracefs.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  fs/tracefs/inode.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
> index c31997a303c7..cdbaa42b44a1 100644
> --- a/fs/tracefs/inode.c
> +++ b/fs/tracefs/inode.c
> @@ -16,6 +16,7 @@
>  #include <linux/module.h>
>  #include <linux/fs.h>
>  #include <linux/mount.h>
> +#include <linux/kobject.h>
>  #include <linux/namei.h>
>  #include <linux/tracefs.h>
>  #include <linux/fsnotify.h>
> @@ -547,10 +548,16 @@ bool tracefs_initialized(void)
>  	return tracefs_registered;
>  }
>  
> +static struct kobject *trace_kobj;
> +
>  static int __init tracefs_init(void)
>  {
>  	int retval;
>  
> +	trace_kobj = kobject_create_and_add("tracing", kernel_kobj);
> +	if (!trace_kobj)
> +		return -EINVAL;
> +
>  	retval = register_filesystem(&trace_fs_type);
>  	if (!retval)
>  		tracefs_registered = true;
> -- 
> 2.1.4
> 

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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