linux-kernel - Re: [alsa-devel] [PATCH V1 1/3] ASoC: fsl: Kconfig: remove dependence of SND_IMX_SOC for SND_SOC_IMX_PCM

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Date:	Mon, 18 Aug 2014 18:52:46 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Shengjiu Wang <shengjiu.wang@...escale.com>, lgirdwood@...il.com,
	broonie@...nel.org, perex@...ex.cz, tiwai@...e.de,
	nicoleotsuka@...il.com, Li.Xiubo@...escale.com, shc_work@...l.ru,
	fabio.estevam@...escale.com, xobs@...agi.com, arnd@...db.de,
	sfr@...b.auug.org.au, timur@...i.org
CC:	alsa-devel@...a-project.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [alsa-devel] [PATCH V1 1/3] ASoC: fsl: Kconfig: remove dependence
 of SND_IMX_SOC for SND_SOC_IMX_PCM_DMA

On 08/18/2014 10:38 AM, Shengjiu Wang wrote:
> Build kernel with SND_SOC_IMC_PCM_DMA=m && SND_IMX_SOC=n leads the following
> error:
>
>     sound/built-in.o: In function `fsl_sai_probe':
>>> fsl_sai.c:(.text+0x5f662): undefined reference to `imx_pcm_dma_init'
>     sound/built-in.o: In function `fsl_esai_probe':
>>> fsl_esai.c:(.text+0x6044b): undefined reference to `imx_pcm_dma_init'
>
> Most cpu driver in soc/fsl has use the function 'imx_pcm_dma_init' which is
> defined in imx-pcm-dma.c, so need to select SND_SOC_IMX_PCM_DMA, but it depends
> on SND_IMX_SOC, if SND_IMX_SOC=n, then SND_SOC_IMX_PCM_DMA will not be
> selected.
> So remove the dependence of SND_IMX_SOC for SND_SOC_IMX_PCM_DMA.
>
> Reported-by: kbuild test robot <fengguang.wu@...el.com>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@...escale.com>

Those if conditions where just added[1] by Arnd to avoid other build 
failures. So just removing them again makes little sense.

As far as I can see imx_pcm_dma_init() should be stubbed out when 
SND_SOC_IMX_PCM_DMA is not selected. So what's going on here?

[1] 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ff40260f79dc0436604452bccd449bffd25ebafb

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