linux-kernel - Re: [PATCH 1/1] Introduce Intel RAPL cooling device driver

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Message-ID: <20130402163357.72dac902@chromoly>
Date:	Tue, 2 Apr 2013 16:33:57 -0700
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Platform Driver <platform-driver-x86@...r.kernel.org>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 1/1] Introduce Intel RAPL cooling device driver

On Tue, 2 Apr 2013 16:00:42 -0700
Greg KH <gregkh@...uxfoundation.org> wrote:

> > +#include "intel_rapl.h"
> > +#include "../../../fs/sysfs/sysfs.h"  
> 
> WTF?
> 
> Oh, that's a sure sign you are not doing something properly, if you
> think it's ok to muck around with the internals of sysfs.
> 
> There's a reason that file is "private", why do you think it's ok to
> use it directly?  Did you just think that I somehow "forgot" to put
> it in the proper include directory?
I did feel unsure about this but i saw some precedence in the kernel.
Anyway, I needed a way to validate a userspace file passed to rapl
driver belong to the same sysfs directory. I will look for alternative
ways.

-- 
Thanks,

Jacob
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