linux-kernel - Re: [PATCH RESEND] tracing: Make tracing work when debugfs is not compiled or initialized.

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Date:	Wed, 4 Nov 2015 10:54:42 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jiaxing Wang <hello.wjx@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] tracing: Make tracing work when debugfs is not
 compiled or initialized.

On Wed, Nov 04, 2015 at 10:03:39AM -0500, Steven Rostedt wrote:
> On Wed,  4 Nov 2015 09:11:18 +0800
> Jiaxing Wang <hello.wjx@...il.com> wrote:
> 
> > Currently tracing_init_dentry() returns -ENODEV when debugfs is not
> > initialized, which causes tracefs not populated with tracing files and
> > directories, so we will get an empty directory even after we manually
> > mount tracefs.
> > 
> > We can make tracing_init_dentry() return NULL as long as tracefs
> > is initialized and get a populated tracefs.
> > 
> > We also need to make global_trace.dir not NULL in order to pass the checks
> > in tracing_get_dentry() and add_tracer_options().
> > 
> > Also added stub debugfs_create_automount() for when debugfs is not
> > configured in.

The debugfs change should be split out into a separate patch, which I'll
be glad to take through my tree, it isn't dependant on the tracing
code at all.

thanks,

greg k-h
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