linux-kernel - Re: [PATCH 0/5] PCI: mt7621: remove specific MIPS code from driver

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Date:   Wed, 17 Nov 2021 13:48:20 +0100
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     linux-pci <linux-pci@...r.kernel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        John Crispin <john@...ozen.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] PCI: mt7621: remove specific MIPS code from driver

On Wed, Nov 17, 2021 at 1:41 PM Thomas Bogendoerfer
<tsbogend@...ha.franken.de> wrote:
>
> On Mon, Nov 15, 2021 at 08:08:04AM +0100, Sergio Paracuellos wrote:
> > Hi all,
> >
> > MIPS specific code can be removed from driver and put into ralink mt7621
> > instead which is a more accurate place to do this. To make this possible
> > we need to have access to 'bridge->windows' in 'pcibios_root_bridge_prepare()'
> > which has been implemented for ralink mt7621 platform (there is no real
> > need to implement this for any other platforms since those ones haven't got
> > I/O coherency units). This also allow us to properly enable this driver to
> > completely be enabled for COMPILE_TEST. This patchset appoarch:
> > - Move windows list splice in 'pci_register_host_bridge()' after function
> >   'pcibios_root_bridge_prepare()' is called.
> > - Implement 'pcibios_root_bridge_prepare()' for ralink mt7621.
> > - Avoid custom MIPs code in pcie-mt7621 driver.
> > - Add missing 'MODULE_LICENSE()' to pcie-mt7621 driver to avoid compile test
> >   module compilation to complain (already sent patch from Yanteng Si that
> >   I have rewrite commit message and long description a bit.
> > - Remove MIPS conditional code from Kconfig.
> >
> > This patchset also fix some errors reported by Kernel Test Robot about
> > implicit mips functions used in driver code and fix errors in driver when
> > is compiled as a module [1] (mips:allmodconfig).
> >
> > There was an ongoing discussion about this here [0] but I preferred to send
> > my proposal for better review and understanding:
>
> so what's the plan with this patchset ? Going in as fix, probably via
> pci tree ? Or is material for next release ? If the latter can we first
> fix the allmodconfig by making the Kconfig symbol bool ?

If the approach is considered valid I guess it should go as a fix to
avoid changing first to 'bool' the Kconfig symbol. If it is not a
valid approach I will send patches with a possible new requested
approach or just making the symbol bool and adding specific mips
includes to driver code to avoid mips implicit functions errors.

Best regards,
    Sergio Paracuellos
>
> Thomas.
>
> --
> Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
> good idea.                                                [ RFC1925, 2.3 ]