Re: [alsa-devel] [PATCH -next] ASoC: SOF: imx8: Fix randbuild error

[Krzysztof Kozlowski]

On Tue, 11 Feb 2020 at 10:46, Daniel Baluta <daniel.baluta@xxxxxxxxx> wrote:
>
> On Tue, Feb 11, 2020 at 3:59 AM Yuehaibing <yuehaibing@xxxxxxxxxx> wrote:
> >
> > On 2020/2/11 5:00, Pierre-Louis Bossart wrote:
> > >
> > >
> > > On 2/10/20 12:15 AM, YueHaibing wrote:
> > >> when do randconfig like this:
> > >> CONFIG_SND_SOC_SOF_IMX8_SUPPORT=y
> > >> CONFIG_SND_SOC_SOF_IMX8=y
> > >> CONFIG_SND_SOC_SOF_OF=y
> > >> CONFIG_IMX_DSP=m
> > >> CONFIG_IMX_SCU=y
> > >>
> > >> there is a link error:
> > >>
> > >> sound/soc/sof/imx/imx8.o: In function 'imx8_send_msg':
> > >> imx8.c:(.text+0x380): undefined reference to 'imx_dsp_ring_doorbell'
> > >>
> > >> Select IMX_DSP in SND_SOC_SOF_IMX8_SUPPORT to fix this
> > >>
> > >> Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
> > >> Fixes: f9ad75468453 ("ASoC: SOF: imx: fix reverse CONFIG_SND_SOC_SOF_OF dependency")
> > >> Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
> > >
> > > Thanks for the report.
> > >
> > > Would you mind sharing the .config and instructions to reproduce this case? we have an unrelated issue with allyesconfig that was reviewed here:
> > >
> > > https://github.com/thesofproject/linux/pull/1778
> > >
> > > and I'd probably a good thing to fix everything in one shot.
> >
> > config is attached, which is on x86_64
>
> Thanks, I think this is legit. It was introduced with:
>
> commit f52cdcce9197fef9d4a68792dd3b840ad2b77117
> Author: Daniel Baluta <daniel.baluta@xxxxxxx>
> Date:   Sat Jan 4 15:39:53 2020 +0000
>
>     firmware: imx: Allow IMX DSP to be selected as module
>
>     IMX DSP is only needed by SOF or any other module that
>     wants to communicate with the DSP. When SOF is build
>     as a module IMX DSP is forced to be built inside the
>     kernel image. This is not optimal, so allow IMX DSP
>     to be built as a module.
>
>     Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxx>
>     Signed-off-by: Shawn Guo <shawnguo@xxxxxxxxxx>

Hi,

Since it's a module, don't you just miss EXPORT_SYMBOL there?

> So, I think we should change the Fixes tag. Are there
> any clear rules on when to use select vs depends?
>
> On my side, I know what both are doing but it is not clear
> when to use them.

Visible symbols usually should not be selected. The same with symbols
with dependencies. The docs have this rule mentioned.

Best regards,
Krzysztof