linux-kernel - Re: [PATCH] spi: mediatek: remove redundant MODULE

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Message-ID: <20180412161323.GH9929@sirena.org.uk>
Date:   Thu, 12 Apr 2018 17:13:23 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Sean Wang <sean.wang@...iatek.com>
Cc:     matthias.bgg@...il.com, linux-spi@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] spi: mediatek: remove redundant MODULE_ALIAS entries

On Wed, Mar 28, 2018 at 11:09:03AM +0800, Sean Wang wrote:
> On Wed, 2018-03-28 at 10:14 +0800, Mark Brown wrote:
> > On Mon, Mar 26, 2018 at 06:04:18PM +0800, sean.wang@...iatek.com wrote:
> > > From: Sean Wang <sean.wang@...iatek.com>

> > > MODULE_ALIAS exports information to allow the module to be auto-loaded at
> > > boot for the drivers registered using legacy platform registration.

> > > However, currently the driver is always used by DT-only platform,
> > > MODULE_ALIAS is redundant and should be removed properly.

> > There is no meaningful cost to having the alias there, why remove it?

> It's no explicitly improved to the driver, it only takes less bytes
> in .secion modinfo from 644 bytes to 620 bytes in the observation with
> objdump.

OK, that's a *very* small saving though especially given the block sizes
that filesystems tend to use.

> More importantly, it seems the driver should probably refer to another
> qualified driver at the initial development, but MODULE_ALIAS is
> forgetting to be removed to meet real usage for the module autoload. 

I can't parse the above, sorry.

> Even I was curious whether people for the driver know the actual purpose
> the macro it's for.

> Removing MODULE_ALIAS is just to correct the driver to where it should
> be.

To me it's the other way around - ideally platform drivers should
remember to set up the MODULE_ALIAS, just as a joining the dots thing to
make sure that things that work when the driver is built in work when
built as a module.

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