Date:   Wed, 1 Dec 2021 14:38:22 -0600
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Sergio Paracuellos <sergio.paracuellos@gmail.com>
Cc:     Guenter Roeck <linux@roeck-us.net>,
        Randy Dunlap <rdunlap@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org
Subject: Re: Linux 5.16-rc3
Message-ID: <20211201203822.GA2840039@bhelgaas>
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[+cc linux-pci]

On Mon, Nov 29, 2021 at 01:18:12PM +0100, Sergio Paracuellos wrote:
> On Mon, Nov 29, 2021 at 5:17 AM Guenter Roeck <linux@roeck-us.net> wrote:
> > On 11/28/21 7:07 PM, Randy Dunlap wrote:
> > > On 11/28/21 17:59, Guenter Roeck wrote:
> > >> ...
> > >> Build results:
> > >>     total: 153 pass: 152 fail: 1
> > >> Failed builds:
> > >>     mips:allmodconfig
> > >> Qemu test results:
> > >>     total: 482 pass: 482 fail: 0
> > >>
> > >> Building mips:allmodconfig ... failed
> > >> --------------
> > >> Error log:
> > >> ERROR: modpost: missing MODULE_LICENSE() in drivers/pci/controller/pcie-mt7621.o
> > >> ERROR: modpost: "mips_cm_unlock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > >> ERROR: modpost: "mips_cpc_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > >> ERROR: modpost: "mips_cm_lock_other" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > >> ERROR: modpost: "mips_cm_is64" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > >> ERROR: modpost: "mips_gcr_base" [drivers/pci/controller/pcie-mt7621.ko] undefined!
> > >>
> > >> There is still no fix for the mips:allmodconfig build problem as far
> > >> as I can see. It is a bit odd, because the fix would be as simple as
> > >>
> > >>   config PCIE_MT7621
> > >> -    tristate "MediaTek MT7621 PCIe Controller"
> > >> -    depends on (RALINK && SOC_MT7621) || (MIPS && COMPILE_TEST)
> > >> +    bool "MediaTek MT7621 PCIe Controller"
> > >> +    depends on SOC_MT7621 || (MIPS && COMPILE_TEST)
> > >>       select PHY_MT7621_PCI
> > >>       default SOC_MT7621
> > >>       help
> > >>
> > >> Context: tristate doesn't make sense here because both RALINK and
> > >> SOC_MT7621 are bool. Also, RALINK is redundant because SOC_MT7621
> > >> already depends on it. The compile failure is due to missing exported
> > >> symbols, and it is only seen if PCIE_MT7621=m - which is only possible
> > >> if COMPILE_TEST=y. In other words, the dependencies above are set such
> > >> that test builds, and only test builds, fail.
> > >>
> > >> The problem was introduced with commit 2bdd5238e756 ("PCI: mt7621:
> > >> Add MediaTek MT7621 PCIe host controller driver"). Copying some of
> > >> those responsible to see if we can expect a solution sometime soon.

Can we do a minimal patch along the lines of the above for v5.16?

We can do the more extensive work as in 
https://lore.kernel.org/r/20211115070809.15529-1-sergio.paracuellos@gmail.com
but that would be material for v5.17.

Bjorn