linux-kernel - Re: [PATCH 5/6 RESEND] mfd: arizona: Remove use of codec build config #ifdefs

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Message-ID: <20151002092312.GM5432@ck-lbox>
Date:	Fri, 2 Oct 2015 10:23:12 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>,
	<sameo@...ux.intel.com>, <patches@...nsource.wolfsonmicro.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6 RESEND] mfd: arizona: Remove use of codec build
 config #ifdefs

On Thu, Oct 01, 2015 at 12:44:52PM +0100, Lee Jones wrote:
> On Mon, 28 Sep 2015, Richard Fitzgerald wrote:
> 
> > Remove the use of #ifdefs around each case statement of the chip ID
> > and type validation switches.
> > 
> > We must ensure that the contained code still compiles to nothing if
> > support for that codec was not built into the kernel, to prevent
> > creation of link references to missing functions. So the ifdefs are
> > replaced with a use of the IS_ENABLED() macro.
> > 
> > Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
> > ---
> >  drivers/mfd/arizona-core.c | 29 +++++++++++++++++++++--------
> >  drivers/mfd/arizona-i2c.c  | 28 +++++++++++++++-------------
> >  drivers/mfd/arizona-spi.c  | 18 +++++++++++-------
> >  3 files changed, 47 insertions(+), 28 deletions(-)
> > 
> > diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> > index 2512192..cc2117e 100644
> > --- a/drivers/mfd/arizona-core.c
> > +++ b/drivers/mfd/arizona-core.c
> > @@ -1130,22 +1130,26 @@ int arizona_dev_init(struct arizona *arizona)
> >  	arizona->rev &= ARIZONA_DEVICE_REVISION_MASK;
> >  
> >  	switch (reg) {
> > -#ifdef CONFIG_MFD_WM5102
> >  	case 0x5102:
> > +		if (!IS_ENABLED(CONFIG_MFD_WM5102))
> > +			break;
> > +
> 
> Are you sure this statement effects the code below?
> 
> I'm not sure it will.  How have you tested it?

Yeah looking at that again I am not sure that is going to cause
that code to be elimated either. Richard is on holiday this week
and next. I will try to find time to have a look at this today.

Thanks,
Charles
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