linux-kernel - Re: [PATCH] ASoC: codecs-ac97: make selectable in config

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Message-ID: <5554F9CF.3020601@metafoo.de>
Date:	Thu, 14 May 2015 21:38:55 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Mark Brown <broonie@...nel.org>
CC:	"Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
	alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Brian Austin <brian.austin@...rus.com>,
	Bard Liao <bardliao@...ltek.com>,
	Oder Chiou <oder_chiou@...ltek.com>,
	Wolfram Sang <wsa@...-dreams.de>, linux-kernel@...r.kernel.org,
	Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH] ASoC: codecs-ac97: make selectable in config

On 05/14/2015 09:28 PM, Mark Brown wrote:
> On Thu, May 14, 2015 at 09:24:15PM +0200, Lars-Peter Clausen wrote:
>> On 05/14/2015 09:10 PM, Mark Brown wrote:
>
>>> Does the select from SND_SOC_AC97_BUS actually happen if it is selected
>>> by SND_SOC_ALL_CODECS?  That's the issue, if it works now it's a
>>> relatively recent thing.
>
>> I'm not sure I fully understand what you mean.
>
>> The Kconfig entry for the CODEC has no 'depends on'. It does a 'select
>> SND_SOC_AC97_BUS', which means all built time dependencies are pulled in
>> this way. So if SND_SOC_ALL_CODECS selects the CODEC unconditionally that
>> should work fine, since no dependencies are bypassed.
>
> No, it's not just dependencies but also selects that get ignored (or
> used to anyway like I say) - a select just forces the symbol on.
>

select forces a symbol on regardless of whether its dependencies are met or 
not. But for any symbol that is on, no matter whether it was manually 
selected or selected by a 'select' from another symbol, any symbols selected 
by that symbol will be turned on. It's been that way as long as I can remember.
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