linux-kernel - Re: [PATCH v2 1/6] perf: Add interface to add general events to sysfs

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Date:	Mon, 25 Jul 2011 08:20:38 -0700
From:	Greg KH <gregkh@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Lin Ming <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH v2 1/6] perf: Add interface to add general events to sysfs

On Mon, Jul 25, 2011 at 10:32:03AM +0200, Peter Zijlstra wrote:
> On Mon, 2011-07-25 at 16:11 +0800, Lin Ming wrote:
> > It's strange that I didn't find a way to check if a directory is present
> > in sysfs. Any hint?
> 
> sysfs is voodoo for me, best I can come up with is, ask the sysfs
> folks ;-)
> 
> Kay, Greg?

What are you trying to do here specifically?

sysfs is not ment to be walked from within the kernel, only from
userspace.  Perhaps that is your problem here?

greg k-h
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