linux-kernel - Re: [PATCH 3/5 v2] tracing: Automatically mount tracefs on debugfs/tracing

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Message-ID: <20150125203115.GJ29656@ZenIV.linux.org.uk>
Date:	Sun, 25 Jan 2015 20:31:15 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/5 v2] tracing: Automatically mount tracefs on
 debugfs/tracing

On Sun, Jan 25, 2015 at 08:27:29PM +0000, Al Viro wrote:

> Turns out that it is better that way (and less prone to abuse).  See
> vfs.git#debugfs_automount; some massage on top of 3.19-rc5, the payoff is
> in the last commit.
> 
> For your code it's a matter of replacing struct path *path with void *unused
> in trace_automount() and just calling
> 	debugfs_create_automount("tracing", NULL, trace_automount, NULL);
> to create the sucker.  That's it - no games with ->d_op, etc.

... and the total is plus 8 lines.  Would be negative, if not for the
kerneldoc comment in there...
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