linux-kernel - Re: [PATCH v2 07/14] regmap: Add SoundWire bus support

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Message-ID: <20171116144813.qb446fhkdzok2fo7@sirena.org.uk>
Date:   Thu, 16 Nov 2017 14:48:13 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        ALSA <alsa-devel@...a-project.org>, Takashi <tiwai@...e.de>,
        Pierre <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Shreyas NC <shreyas.nc@...el.com>, patches.audio@...el.com,
        alan@...ux.intel.com,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Sagar Dharia <sdharia@...eaurora.org>,
        srinivas.kandagatla@...aro.org, plai@...eaurora.org,
        Sudheer Papothi <spapothi@...eaurora.org>
Subject: Re: [PATCH v2 07/14] regmap: Add SoundWire bus support

On Thu, Nov 16, 2017 at 06:32:35PM +0530, Vinod Koul wrote:
> On Thu, Nov 16, 2017 at 12:04:37PM +0000, Mark Brown wrote:
> > On Fri, Nov 10, 2017 at 05:19:09PM +0530, Vinod Koul wrote:

> > > +EXPORT_SYMBOL(__regmap_init_sdw);

> > We still have plain EXPORT_SYMBOL() on the regmap exports...

> I assumed after Alan's clarification that it is okay to do so. Let me know if
> you feel otherwise

No, I'm not which is why I replied to Alan's most recent mail explaining
that I felt he was missing my point.  For the bus code itself I don't
really care either way, this is just about this one file.

To repeat this is a pretty thin layer of code tying regmap and Soundwire
together, it's not as substantial as the bus code itself.  The exports
have no meaning outside of a kernel context and within that context it's
hard to see a natural use case for doing this.  It's much easier to see
cases where someone causes themselves problems by reading too much into
the use of plain EXPORT_SYMBOL(), perhaps not considering things as
carefully as they might otherwise have done.

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