linux-kernel - Re: BUG? 2.6.24-rc*[-mm*] - debugfs subdirs missing on x86

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Date:	Fri, 18 Jan 2008 16:13:03 -0500
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>, prasanna@...ibm.com,
	ananth@...ibm.com, anil.s.keshavamurthy@...el.com,
	davem@...emloft.net
Subject: Re: BUG? 2.6.24-rc*[-mm*] - debugfs subdirs missing on x86_64

On Fri, 2008-01-18 at 12:19 -0800, Greg KH wrote:
> On Fri, Jan 18, 2008 at 03:12:33PM -0500, Lee Schermerhorn wrote:
> > I searched around the archives and web and didn't find any reports on
> > this [maybe just missed them?], so I MUST be doing something
> > wrong/stupid.  My config [included] may be the culprit.  Apologies for
> > the long cc list.  I'm copying the kprobes and blktrace maintainers
> > [addresses from MAINTAINERS] to verify that they're NOT seeing this
> > problem.
> > 
> > Problem:  I see no sub-directories below /sys/kernel/debug on x86_64
> 
> Have you mounted debugfs on /sys/kernel/debug?  Try:
> 	mount -t debugfs none /sys/kernel/debug
> as root and see if the files are present or not.

D'oh! [or something stronger]  I KNEW it was something stupid.  I
thought it strange that there were no reports of something this glaring.
That's why I took so long investigating before I finally asked.

I've used debugfs+mmtrace on x86_64 in the past and I've had the debugfs
mount in my test systems' fstab for so long that I don't even think
about it [obviously!].  I moved to a different test system a couple of
months ago and apparently brought over an old fstab patch.

Sorry for the noise [he says sheepishly].

Lee

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