linux-kernel - Re: [PATCH] bcma: Fix 'allmodconfig' and BCMA builds on MIPS targets

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Date:   Sun, 14 Jan 2018 13:40:50 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matt Redfearn <matt.redfearn@...tec.com>,
        James Hogan <jhogan@...nel.org>,
        Linux MIPS Mailing List <linux-mips@...ux-mips.org>
Subject: Re: [PATCH] bcma: Fix 'allmodconfig' and BCMA builds on MIPS targets

[ copying linux-mips ]

On 01/14/2018 01:34 PM, Guenter Roeck wrote:
> Mips builds with BCMA host mode enabled fail in mainline and -next
> with:
> 
> In file included from include/linux/bcma/bcma.h:10:0,
>                   from drivers/bcma/bcma_private.h:9,
> 		 from drivers/bcma/main.c:8:
> include/linux/bcma/bcma_driver_pci.h:218:24: error:
> 	field 'pci_controller' has incomplete type
> 
> Bisect points to commit d41e6858ba58c ("MIPS: Kconfig: Set default MIPS
> system type as generic") as the culprit. Analysis shows that the commmit
> changes PCI configuration and enables PCI_DRIVERS_GENERIC. This in turn
> disables PCI_DRIVERS_LEGACY. 'struct pci_controller' is, however, only
> defined if PCI_DRIVERS_LEGACY is enabled.
> 
> Ultimately that means that BCMA_DRIVER_PCI_HOSTMODE depends on
> PCI_DRIVERS_LEGACY. Add the missing dependency.
> 
> Fixes: d41e6858ba58c ("MIPS: Kconfig: Set default MIPS system type as ...")
> Cc: Matt Redfearn <matt.redfearn@...tec.com>
> Cc: James Hogan <jhogan@...nel.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> I am aware that this problem has been reported several times. I have
> not been able to find a fix, but I may have missed it. If so, my
> apologies for the noise.
> 
I should have said "I have not been able to find a patch fixing it".

> Also note that this is not the only fix required; commit d41e6858ba58c,
> as simple as it looks like, does a pretty good job messing up
> "mips:allmodconfig" builds.
> 
... nor did I find patch(es) fixing the other build problem(s) introduced
by d41e6858ba58c.

Guenter

>   drivers/bcma/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig
> index 02d78f6cecbb..ba8acca036df 100644
> --- a/drivers/bcma/Kconfig
> +++ b/drivers/bcma/Kconfig
> @@ -55,7 +55,7 @@ config BCMA_DRIVER_PCI
>   
>   config BCMA_DRIVER_PCI_HOSTMODE
>   	bool "Driver for PCI core working in hostmode"
> -	depends on MIPS && BCMA_DRIVER_PCI
> +	depends on MIPS && BCMA_DRIVER_PCI && PCI_DRIVERS_LEGACY
>   	help
>   	  PCI core hostmode operation (external PCI bus).
>   
>