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

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Date:   Thu, 10 May 2018 13:35:26 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Michael Büsch <m@...s.ch>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        Larry Finger <larry.finger@...inger.net>,
        Matt Redfearn <matt.redfearn@...s.com>,
        "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

On 10 May 2018 at 13:26, Michael Büsch <m@...s.ch> 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?

I guess so.


> 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.

I agree current dependency on PCI_DRIVERS_LEGACY doesn't make sense.
It doesn't break thing though, thanks to the || !MIPS. I'm going to
fix that up in separated patch.

-- 
Rafał