linux-kernel - Re: [Fwd: Fwd: Re: Why is dynamic debug disabled for staging drivers ?]

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Message-ID: <20110406191559.GB6981@redhat.com>
Date:	Wed, 6 Apr 2011 15:16:00 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Joe Perches <joe@...ches.com>, LKML <linux-kernel@...r.kernel.org>,
	Roland Vossen <rvossen@...adcom.com>,
	devel <devel@...uxdriverproject.org>
Subject: Re: [Fwd: Fwd: Re: Why is dynamic debug disabled for staging drivers
 ?]

On Wed, Apr 06, 2011 at 11:55:25AM -0700, Greg KH wrote:
> On Wed, Apr 06, 2011 at 02:41:59PM -0400, Jason Baron wrote:
> > The concern I would have in allowing tainted modules is that we are
> > relying on a specific format for the dynamic debug section in the
> > compiled module. For example, if a module was built with a format with an old
> > section, we could potentially get confused. This can be solved with
> > versioning, but that adds extra complexity. We can of course also make
> > sure we don't change the format...
> 
> I wouldn't worry about that at all.  If you try to load a kernel module
> that was not built against the kernel you are running, all bets are off
> and lots of bad things can happen in other areas.
> 
> > Notice that tracepoints, which also rely on a specific module format,
> > also employ a taint flag check.
> 
> Ok, but TAINT_CRAP shouldn't be part of that check, right?
> 

Right, allowing -staging drivers (which are part of the kernel tree) to
make use of dynamic debug facility seems reasonable.

thanks,

-Jason
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