linux-kernel - Re: [PATCH] platform/x86: intel_pmc_ipc: Delete unused function ipc_data

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Date:   Wed, 24 May 2017 08:39:29 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     Matthias Kaehlcke <mka@...omium.org>,
        Zha Qipeng <qipeng.zha@...el.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] platform/x86: intel_pmc_ipc: Delete unused function ipc_data_readb()

Hi,

On Wed, May 24, 2017 at 6:39 AM, Alan Cox <gnomes@...rguk.ukuu.org.uk> wrote:
> On Tue, 23 May 2017 13:55:39 -0700
> Matthias Kaehlcke <mka@...omium.org> wrote:
>
>> The function was added by commit 0a8b83530b6f ("intel_pmc_ipc: Add Intel
>> Apollo Lake PMC IPC driver") in 2015 and hasn't been used since then.
>> Removing it fixes the following warning when building with clang:
>>
>>     drivers/platform/x86/intel_pmc_ipc.c:189:18: error: unused function
>>         'ipc_data_readb' [-Werror,-Wunused-function]
>
> It is however also part of the API and a consistent sensible function to
> have present should it be needed. As it's static it's eliminated
> correctly by gcc.
>
> I'm all for eliminating unused functions but in this case I have to wonder

If it's a useful function to have present, it seems like adding
"__maybe_unused" makes sense, as Matthias did in
<https://patchwork.kernel.org/patch/9732009/>.  Would that work for
you?

-Doug