linux-kernel - Re: [PATCH 0/6] drivers/dma: drop modular code from non modular drivers

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Date:	Thu, 10 Dec 2015 00:29:27 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kernel@...r.kernel.org, Alexandre Courbot <gnurou@...il.com>,
	linux-tegra@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	Thierry Reding <thierry.reding@...il.com>,
	dmaengine@...r.kernel.org, Dan Williams <dan.j.williams@...el.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Daniel Mack <daniel@...que.org>
Subject: Re: [PATCH 0/6] drivers/dma: drop modular code from non modular drivers

On Wednesday 09 December 2015 18:21:56 Paul Gortmaker wrote:
> This series of commits is a slice of a larger project to ensure
> people don't have dead code for module removal in non-modular
> drivers.  Overall there is roughly 5k lines of dead code in the
> kernel due to this.
> 
> There is a quasi-separate theme, in that some of the drivers were
> allowing an unbind implicitly since it is enabled by default.  But
> for core DMA infrastructure drivers, this doesn't seem useful -- so
> we also disable that here which allows us to delete any ".remove"
> functions from the drivers that would otherwise be called during the
> (impossible to trigger) module removal.
> 
> Since ARM covers these files the best of all architectures, each
> file was build tested for allmodconfig on ARM, which at the same
> time confirms that the files are not built with "CC [M]" -- hence
> genuinely non-modular.
> 
> My testing and the larger patch series in general has been done
> against the latest linux-next tree.
> 
> 

We are in the process of changing the DMA drivers to a new way of
passing the "filter" function around. We can soon build them
all as loadable modules again.

	Arnd
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