linux-kernel - Re: [RFC 01/32] Kconfig: introduce and depend on LEGACY

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Message-ID: <281298ec-3898-9b02-1d92-66bf6df41170@roeck-us.net>
Date:   Mon, 27 Dec 2021 09:48:50 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Arnd Bergmann <arnd@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        John Garry <john.garry@...wei.com>,
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        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Guo Ren <guoren@...nel.org>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Ian Abbott <abbotti@....co.uk>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
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        Dmitry Torokhov <dmitry.torokhov@...il.com>,
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        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>,
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Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
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Subject: Re: [RFC 01/32] Kconfig: introduce and depend on LEGACY_PCI

On 12/27/21 8:42 AM, Niklas Schnelle wrote:
> Introduce a new LEGACY_PCI Kconfig option which gates support for legacy
> PCI devices including those attached to a PCI-to-PCI Express bridge and
> PCI Express devices using legacy I/O spaces. Note that this is different
> from non PCI uses of I/O ports such as by ACPI.
> 
> Add dependencies on LEGACY_PCI for all PCI drivers which only target
> legacy PCI devices and ifdef legacy PCI specific functions in ata
> handling.
> 

This effectively disables all default configurations which now depend
on CONFIG_LEGACY_PCI. Yet, I don't see CONFIG_LEGACY_PCI added to
configuration files which explicitly enable any of the affected
configurations. Is that on purpose ? If so, I think it should at least
be mentioned in the commit description. However, I think it would be
more appropriate to either delete all affected configuration flags from
the affected configuration files, or to add CONFIG_LEGACY_PCI=y to those
files.

Guenter