linux-kernel - Re: [PATCH V2 1/2] Revert "ssb: Prevent build of PCI host features in module"

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Message-ID: <CACna6rxY16UzVPpMy+kKpun8ZVY+b5THBuCjvCG9tF0t9hcNBA@mail.gmail.com>
Date:   Fri, 11 May 2018 12:25:33 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Michael Büsch <m@...s.ch>,
        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 V2 1/2] Revert "ssb: Prevent build of PCI host features in module"

On 11 May 2018 at 12:13, Kalle Valo <kvalo@...eaurora.org> wrote:
> Rafał Miłecki <zajec5@...il.com> writes:
>
>> On 11 May 2018 at 11:17, Rafał Miłecki <zajec5@...il.com> wrote:
>>> From: Rafał Miłecki <rafal@...ecki.pl>
>>>
>>> This reverts commit 882164a4a928bcaa53280940436ca476e6b1db8e.
>>>
>>> Above commit added "SSB = y" dependency to the wrong symbol
>>> SSB_DRIVER_PCICORE_POSSIBLE and prevented SSB_DRIVER_PCICORE from being
>>> selected when needed. PCI core driver for core running in clienthost
>>> mode is important for bus initialization. It's perfectly valid scenario
>>> to have ssb built as module and use it with buses on PCI cards.
>>>
>>> This fixes regression that affected all *module* users with PCI cards.
>>>
>>> Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1572349
>>> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
>>
>> As these patches fix regression/build error, I believe both should get
>> into 4.17.
>
> How much confidence do we have that we don't need to end up reverting
> patch 2 as well? I rather be pushing patch 2 to 4.18 so that there's
> more time for testing and waiting for feedback.

Solution from 2/2 seems pretty obvious.

1) Enabling SSB_PCICORE_HOSTMODE compiles code that requires
non-exported symbols. Requiring "SSB = y" seems pretty obvious.
2) As pointed in another e-mail bcma has pretty identical solution
that seems to be working well, see commit 79ca239a68f8f ("bcma:
Prevent build of PCI host features in module").

That's just my opinion though, I shared since you asked.

If you prefer to queue that for 4.18, I'm OK. After all:
1) This problem affects MIPS arch only
2) It can be fixed by not selecting BCMA_DRIVER_PCI_HOSTMODE for SSB = m

-- 
Rafał