linux-kernel - Re: [RFC PATCH] ssb: relax SSB

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Message-ID: <20231008093520.42ead15f@barney>
Date:   Sun, 8 Oct 2023 09:35:20 +0200
From:   Michael Büsch <m@...s.ch>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [RFC PATCH] ssb: relax SSB_EMBEDDED dependencies

Hi Randy,

thanks for the patch.

On Sat,  7 Oct 2023 11:24:43 -0700
Randy Dunlap <rdunlap@...radead.org> wrote:

> This is a kconfig warning in a randconfig when CONFIG_PCI is not set:
> 
> WARNING: unmet direct dependencies detected for SSB_EMBEDDED
>   Depends on [n]: SSB [=y] && SSB_DRIVER_MIPS [=y] &&
> SSB_PCICORE_HOSTMODE [=n] Selected by [y]:
>   - BCM47XX_SSB [=y] && BCM47XX [=y]
> 
> This is caused by arch/mips/bcm47xx/Kconfig's symbol BCM47XX_SSB
> selecting SSB_EMBEDDED when CONFIG_PCI is not set.
> 
> This warning can be prevented by having SSB_EMBEDDED not depend on
> SSB_PCICORE_HOSTMODE, although some parts of SSB use PCI.

> diff -- a/drivers/ssb/Kconfig b/drivers/ssb/Kconfig
> --- a/drivers/ssb/Kconfig
> +++ b/drivers/ssb/Kconfig
> @@ -134,7 +134,7 @@ config SSB_SFLASH
>  # Assumption: We are on embedded, if we compile the MIPS core.
>  config SSB_EMBEDDED
>  	bool
> -	depends on SSB_DRIVER_MIPS && SSB_PCICORE_HOSTMODE
> +	depends on SSB_DRIVER_MIPS
>  	default y
>  
>  config SSB_DRIVER_EXTIF

Could we instead make SSB_EMBEDDED depend on SSB_PCICORE_HOSTMODE if
PCI!=n. Wouldn't that also solve the problem?

I don't fully remember how all this ssb config stuff works, but to
me adding a PCICORE->PCI dependency sounds safer against build
regressions in some other configurations.

What do you think?

-- 
Michael Büsch
https://bues.ch/

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