linux-kernel - Re: [PATCH 4.17 2/2] ssb: make SSB_PCICORE

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Date:   Thu, 10 May 2018 12:35:07 +0100
From:   Matt Redfearn <matt.redfearn@...s.com>
To:     Michael Büsch <m@...s.ch>,
        Rafał Miłecki <zajec5@...il.com>
CC:     Kalle Valo <kvalo@...eaurora.org>,
        Larry Finger <larry.finger@...inger.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH 4.17 2/2] ssb: make SSB_PCICORE_HOSTMODE depend on SSB = y

Hi,

On 10/05/18 12:26, Michael Büsch wrote:
> On Thu, 10 May 2018 13:20:01 +0200
> Rafał Miłecki <zajec5@...il.com> wrote:
> 
>> On 10 May 2018 at 13:17, Michael Büsch <m@...s.ch> wrote:
>>> On Thu, 10 May 2018 13:14:01 +0200
>>> Rafał Miłecki <zajec5@...il.com> wrote:
>>>   
>>>> From: Rafał Miłecki <rafal@...ecki.pl>
>>>>
>>>> SSB_PCICORE_HOSTMODE protects MIPS specific code that calls not exported
>>>> symbols pcibios_enable_device and register_pci_controller. This code is
>>>> supposed to be compiled only with ssb builtin.
>>>>
>>>> This fixes:
>>>> ERROR: "pcibios_enable_device" [drivers/ssb/ssb.ko] undefined!
>>>> ERROR: "register_pci_controller" [drivers/ssb/ssb.ko] undefined!
>>>> make[1]: *** [scripts/Makefile.modpost:92: __modpost] Error 1
>>>>
>>>> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
>>>> ---
>>>>   drivers/ssb/Kconfig | 2 +-
>>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/ssb/Kconfig b/drivers/ssb/Kconfig
>>>> index b3f5cae98ea6..c574dd210500 100644
>>>> --- a/drivers/ssb/Kconfig
>>>> +++ b/drivers/ssb/Kconfig
>>>> @@ -131,7 +131,7 @@ config SSB_DRIVER_PCICORE
>>>>
>>>>   config SSB_PCICORE_HOSTMODE
>>>>        bool "Hostmode support for SSB PCI core"
>>>> -     depends on SSB_DRIVER_PCICORE && SSB_DRIVER_MIPS
>>>> +     depends on SSB_DRIVER_PCICORE && SSB_DRIVER_MIPS && SSB = y
>>>>        help
>>>>          PCIcore hostmode operation (external PCI bus).
>>>>   
>>>
>>>
>>> I think we also need to depend on PCI_DRIVERS_LEGACY.
>>> See the other patch that floats around.
>>
>> I believe it's already handled by SSB_PCIHOST_POSSIBLE's dependency on
>> PCI_DRIVERS_LEGACY.
> 
> 
> That dependency seems to be wrong there.
> Was it added among some other "let's just unbreak some random
> build" change as well?

Yeah - that was commit 58eae1416b80 ("ssb: Disable PCI host for 
PCI_DRIVERS_GENERIC").

> 
> SSB_PCIHOST enables support for SSB on top of PCI. (Which is 99% of it
> uses). I don't see how this uses the legacy API.
> 
> SSB_PCICORE_HOSTMODE enables PCI on top of SSB. Which is a MIPS corner
> case. This uses the legacy MIPS API to register a PCI bus.
> 

Yeah the dependency would seem to be in the wrong place and should be on 
SSB_PCICORE_HOSTMODE, in the same way as the bcma driver - commits 
664eadd6f44b ("bcma: Fix 'allmodconfig' and BCMA builds on MIPS 
targets") & 79ca239a68f8 ("bcma: Prevent build of PCI host features in 
module").

Thanks,
Matt