linux-kernel - Re: Is devm

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Message-ID: <20150804195631.GB28564@amd>
Date:	Tue, 4 Aug 2015 21:56:31 +0200
From:	Pavel Machek <pavel@....cz>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Tejun Heo <tj@...nel.org>, Dan Williams <dan.j.williams@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Is devm_* broken ?

On Tue 2015-07-28 20:05:49, Laurent Pinchart wrote:
> On Tuesday 28 July 2015 11:22:25 Tejun Heo wrote:
> > On Tue, Jul 28, 2015 at 05:16:16PM +0300, Laurent Pinchart wrote:
> > > Using devm_kzalloc() in such a way has value though, and reverting drivers
> > > to the pre-devm memory allocation code would make error handling and
> > > cleanup code paths more complex again. Should we introduce a managed
> > > allocator for that purpose that would have a lifespan explicitly handled
> > > by drivers ?
> >
> > I don't know.  Sure, we can have memory allocations which are tied to
> > open file; however, the distinction between that and regular devm
> > resources, which can't linger on no matter what, would be subtle and
> > confusing.  IMHO, a better approach would be implmenting generic
> > revoke feature and sever open files on driver detach so that
> > everything can be shutdown then.
> 
> Sounds like a topic for the kernel summit :-) I'll send a proposal.

Hmm. But that means that devm_ everything is broken for 6 months or
so, right?

Does it mean we should stop taking new devm_ conversions at the very
least?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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