linux-kernel - Re: [PATCH 3/3] power: bq27xxx_battery: fix defined but not used warnings

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Message-ID: <20151016144705.GG28216@pali>
Date:	Fri, 16 Oct 2015 16:47:05 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	"Andrew F . Davis" <afd@...com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] power: bq27xxx_battery: fix defined but not used
 warnings

On Friday 16 October 2015 15:44:12 Sebastian Reichel wrote:
> If BQ27XXX is enabled, but neither I2C based initialization, nor
> platform based initialization are activated, bq27xxx_powersupply_init
> and bq27xxx_powersupply_unregister are defined but not used.
> 
> This configuration doesn't make sense, but there is no easy way
> to make it unavailable in the build system, so just mark the
> functions as __maybe_unused instead.
> 

What about?

#if defined(CONFIG_1) || defined(CONFIG_2)
#define NEED_POWER_SUPPLY
#endif

And then wrap power supply code into #ifdef NEED_POWER_SUPPLY?

-- 
Pali Rohár
pali.rohar@...il.com
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