linux-kernel - Re: [PATCH] of: rexport of_find_next_cache

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Message-ID: <20231011143836.q4c5rf6eqb2i6p53@bogus>
Date:   Wed, 11 Oct 2023 15:38:36 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Arnd Bergmann <arnd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yang Yang <yang.yang29@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sebastian Reichel <sre@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: rexport of_find_next_cache_node()

On Wed, Oct 11, 2023 at 04:05:47PM +0200, Arnd Bergmann wrote:
> On Wed, Oct 11, 2023, at 15:59, Sudeep Holla wrote:
> > On Wed, Oct 11, 2023 at 03:14:08PM +0200, Arnd Bergmann wrote:
> >> From: Arnd Bergmann <arnd@...db.de>
> >> 
> >> This function is now called from a cpufreq driver, but that breaks the
> >> build when the caller is in a loadable module, because of a missing
> >> export:
> >> 
> >> ERROR: modpost: "of_find_next_cache_node" [drivers/cpufreq/qcom-cpufreq-nvmem.ko] undefined!
> >> 
> >> Export this as a GPL-only symbol, like the other related functions in
> >> this file.
> >> 
> >> Fixes: 7683a63c08ff5 ("cpufreq: qcom-nvmem: create L2 cache device")
> >> Fixes: a3e31b4588443 ("of: Move definition of of_find_next_cache_node into common code.")
> >
> > I am bit confused as I see commit a3e31b4588443 didn't drop the export.
> > So how is this change fixing that commit ?
>
> My mistake, I was looking for the commit that initially introduced
> the function, but didn't notice that this just moved it from powerpc.
>
> I could have used "Fixes: e523f723d69cd ("powerpc: Add
> of_find_next_cache_node()")", but it's probably best to just
> leave that line out entirely.
>

Yes I was thinking to drop it as it is quite old commit(both a3e31b4588443 and
e523f723d69cd) and I don't see any point in merging this to all the concerned
stable trees as they must not have this new user.

That said it is not a complex change, so I am fine either way, just thought
of raising it in case it was not intentional.

--
Regards,
Sudeep