linux-kernel - Re: [PATCH] xen/debugfs: Check debugfs initialization before using it

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Message-ID: <20131209184050.GC28986@kroah.com>
Date:	Mon, 9 Dec 2013 10:40:50 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Ethan Zhao <ethan.kernel@...il.com>
Cc:	konrad.wilk@...cle.com, raghavendra.kt@...ux.vnet.ibm.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xen/debugfs: Check debugfs initialization before using it

On Mon, Dec 09, 2013 at 09:42:23PM +0800, Ethan Zhao wrote:
> Greg,
>     I am the man who built a Xen dom0, but couldn't see debugfs
> directory and files as expected. there is no warning or tip for me to
> enable the CONFIG_DEBUG_FS=y in .config , it cost me minutes to figure
> out what's
> the matter. and I know should check defugfs config and initialization as
> zswap_debugfs, tracer_debugfs ,rproc_debugfs did. Is it useless ? if
> it could save me just 1 minute next time ?

So you would want a "warning" showing up for every single part of the
kernel that uses debugfs for when it isn't enabled?  That doesn't make
too much sense now, does it?

If you need/want debugfs then enable it in the kernel build, it's not
that hard, right?

greg k-h
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