netdev - Re: [net-next PATCH v7 04/16] of: mdio: Refactor of_phy_find

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Date:   Wed, 17 Mar 2021 14:15:20 +0530
From:   Calvin Johnson <calvin.johnson@....nxp.com>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Grant Likely <grant.likely@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Marcin Wojtas <mw@...ihalf.com>,
        Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
        Jon <jon@...id-run.com>, Saravana Kannan <saravanak@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-arm-kernel@...ts.infradead.org,
        Diana Madalina Craciun <diana.craciun@....com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux.cj@...il.com, netdev@...r.kernel.org,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next PATCH v7 04/16] of: mdio: Refactor of_phy_find_device()

Hi Daniel,

On Tue, Mar 16, 2021 at 07:17:19PM +0000, Daniel Thompson wrote:
> On Thu, Mar 11, 2021 at 11:49:59AM +0530, Calvin Johnson wrote:
> > Refactor of_phy_find_device() to use fwnode_phy_find_device().
> > 
> > Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> 
> This patch series is provoking depmod dependency cycles for me and
> it bisected down to this patch (although I think later patches in
> the series add further cycles).
> 
> The problems emerge when running modules_install either directly or
> indirectly via packaging rules such as bindeb-pkg.
> 
> ~~~
> make -j16 INSTALL_MOD_PATH=$PWD/modules modules_install
> ...
>   INSTALL sound/usb/misc/snd-ua101.ko
>   INSTALL sound/usb/snd-usb-audio.ko
>   INSTALL sound/usb/snd-usbmidi-lib.ko
>   INSTALL sound/xen/snd_xen_front.ko
>   DEPMOD  5.12.0-rc3-00009-g1fda33bf463d
> depmod: ERROR: Cycle detected: fwnode_mdio -> of_mdio -> fwnode_mdio
> depmod: ERROR: Found 2 modules in dependency cycles!
> ~~~
> 
> Kconfig can be found here:
> https://gist.github.com/daniel-thompson/6a7d224f3d3950ffa3f63f979b636474
> 
> This Kconfig file is for a highly modular kernel derived from the Debian
> 5.10 arm64 kernel config. I was not able to reproduce using the defconfig
> kernel for arm64.
> 
Thanks for catching this. I'm able to reproduce the issue and will fix it.

By the way, is there any integration tool/mechanism out there to which I can
submit the patch series and build for various possible configs like these?

Thanks
Calvin