linux-kernel - Re: [RFC 0/6] pcmcia: separate 16-bit support from cardbus

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Date:   Tue, 28 Feb 2023 19:13:48 -0600
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Arnd Bergmann <arnd@...db.de>, Arnd Bergmann <arnd@...nel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        linux-kernel@...r.kernel.org
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Ian Abbott <abbotti@....co.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        Kevin Cernekee <cernekee@...il.com>,
        Lukas Wunner <lukas@...ner.de>,
        Manuel Lauss <manuel.lauss@...il.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Olof Johansson <olof@...om.net>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        YOKOTA Hiroshi <yokota@...lab.is.tsukuba.ac.jp>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-can@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-wireless@...r.kernel.org, Netdev <netdev@...r.kernel.org>
Subject: Re: [RFC 0/6] pcmcia: separate 16-bit support from cardbus

On 2/28/23 02:37, Arnd Bergmann wrote:
> My intention was to keep Cardbus support working with old defconfig files,
> and I've not moved CONFIG_CARDBUS into a separate submenu between
> CONFIG_PCI_HOTPLUG and CONFIG_PCI_CONTROLLER but left the driver in
> drivers/pci/hotplug. I think that's the best compromise here, but maybe
> the PCI maintainers have a better idea.

Arnd,

I did a bit more investigation. My original .config had CONFIG_PCI_HOTPLUG not 
defined, but did have CONFIG_CARDBUS and the various yenta modules turned on. 
With your changes, the CONFIG_PCI_HOTPLUG overrode CARDBUS.

I thought mine was a corner case, but now I am not sure. As stated above, the 
Debian 12 factory configuration for ppc32 does not turn on PCI hotplug, but the 
x86_64 configuration for openSUSE Tumbleweed does. The x86_64 configuration in 
Fedora 37 does not contain CONFIG_PCI_HOTPLUG, but does have CARDBUS set.

It seems that several distros may get the wrong result with this change,

Larry