linux-kernel - Re: [PATCH 4/5] mmc: use EXPORT_SYMBOL_GPL for mmc_detect

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Date:   Mon, 31 Jul 2023 18:57:22 +0200
From:   Christoph Hellwig <hch@....de>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Yangbo Lu <yangbo.lu@....com>,
        Joshua Kinard <kumba@...too.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        linux-arm-kernel@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        linux-mmc@...r.kernel.org, netdev@...r.kernel.org,
        linux-rtc@...r.kernel.org, linux-modules@...r.kernel.org
Subject: Re: [PATCH 4/5] mmc: use EXPORT_SYMBOL_GPL for mmc_detect_change

On Mon, Jul 31, 2023 at 10:38:05AM +0200, Christoph Hellwig wrote:
> mmc_detect_change is used via symbol_get, which was only ever intended
> for very internal symbols like this one.  Use EXPORT_SYMBOL_GPL
> for it so that symbol_get can enforce only being used on
> EXPORT_SYMBOL_GPL symbols.

Btw, I really wonder if this should actually be used through symbol_get.
It seems like the MIPS/alchemy boards should simply require MMC to be
built in and not modular, or the IRQ handlers should move into a driver.

That would be a much less mechanical change, but this use really looks
a bit odd.  And makes me wonder if we should only allow symbol_get
on symbols specifically marked to supported it, but that would be
another incremental step.