linux-kernel - Re: [PATCH 04/13] arm: drop an obsolete ifdef with the removed config PCI_HOST

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Date:   Fri, 29 Oct 2021 07:53:17 +0200
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Sekhar Nori <nsekhar@...com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linusw@...nel.org>,
        Imre Kaloz <kaloz@...nwrt.org>,
        Krzysztof Halasa <khalasa@...p.pl>,
        Avi Fishman <avifishman70@...il.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/13] arm: drop an obsolete ifdef with the removed config PCI_HOST_ITE8152

On Thu, Oct 28, 2021 at 5:35 PM Russell King (Oracle)
<linux@...linux.org.uk> wrote:
>
> On Thu, Oct 28, 2021 at 04:46:38PM +0200, Arnd Bergmann wrote:
> > On Thu, Oct 28, 2021 at 4:19 PM Lukas Bulwahn <lukas.bulwahn@...il.com> wrote:
> > >
> > > Commit 6da5238fa384 ("ARM: 8993/1: remove it8152 PCI controller driver")
> > > removes the config PCI_HOST_ITE8152, but left a dangling obsolete ifndef
> > > in ./arch/arm/kernel/bios32.c.
> > >
> > > Hence, ./scripts/checkkconfigsymbols.py warns:
> > >
> > > PCI_HOST_ITE8152
> > > Referencing files: arch/arm/kernel/bios32.c
> > >
> > > Remove this obsolete ifndef.
> > >
> > > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> >
> > Reviewed-by: Arnd Bergmann <arnd@...db.de>
> >
> > I wonder if we should just remove this function and use the
> > (non-empty) default version instead.
> >
> > 96c5590058d7 ("PCI: Pull PCI 'latency timer' setup up into the core")
> > introduced that generic version, and I suspect the arm version
> > was left out by mistake, but it's not clear from that patch.
>
> That was because PCI_HOST_ITE8152 needed something different from the
> "do nothing" default (setting the PCI latency timer to default to 64
> as the new generic code did.)
>

So, can we just drop the empty pcibios_set_master() function in
bios32.c and the pci handling will now (after the removal of
PCI_HOST_ITE8152) just do The Right Thing(TM)?

If you can confirm that, I will send an updated patch here.

Thanks,

Lukas