linux-kernel - Re: [PATCH] of: Kconfig: Let OF_UNITTEST depend on "I2C=y" and "I2C

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Date:	Fri, 6 Mar 2015 03:51:02 +0800
From:	Chen Gang <xili_gchen_5257@...mail.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Arnd Bergmann <arnd@...db.de>
CC:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] of: Kconfig: Let OF_UNITTEST depend on "I2C=y" and "I2C_MUX=y"

On 3/5/15 16:06, Geert Uytterhoeven wrote:
> On Wed, Mar 4, 2015 at 8:49 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> --- a/drivers/of/unittest.c
>> +++ b/drivers/of/unittest.c
>> @@ -979,7 +979,7 @@ static int of_path_platform_device_exists(const char *path)
>>         return pdev != NULL;
>>  }
>>
>> -#if IS_ENABLED(CONFIG_I2C)
>> +#if IS_BUILTIN(CONFIG_I2C)
> 
> Wondering: is there any advantage in using "#if IS_BUILTIN(CONFIG_XXX)"
> instead of "#ifdef CONFIG_XXX"?
> 

For me, "#if IS_BUILTIN(CONFIG_XXX)" is better than "#ifdef CONFIG_XXX":

 - "#if IS_BUILTIN(CONFIG_XXX)" is only for CONFIG_XXX=y, and its name
   is also obvious.

 - "#ifdef CONFIG_XXX" may be for others, e.g. CONFIG_DEFCONFIG_LIST:

   .config:13:CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
   include/generated/autoconf.h:1174:#define CONFIG_DEFCONFIG_LIST "/lib/modules/$UNAME_RELEASE/.config"


And this time, arnd's patch is OK to me.

Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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