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

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Message-ID: <20170525142634.5eb899d6@alans-desktop>
Date:   Thu, 25 May 2017 14:26:34 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Doug Anderson <dianders@...omium.org>
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()

On Wed, 24 May 2017 08:39:29 -0700
Doug Anderson <dianders@...omium.org> wrote:

> 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?
> 

Yep

Alan