[net-next PATCH v7 04/16] of: mdio: Refactor of_phy_find_device()

[Calvin Johnson]

On Fri, Mar 19, 2021 at 11:21:15AM +0000, Daniel Thompson wrote:
> On Wed, Mar 17, 2021 at 02:15:20PM +0530, Calvin Johnson wrote:
> > 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 at oss.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=$PWD/modules modules_install
> > > ...
> > >   INSTALL sound/usb/misc/snd-ua101.ko
> > >   INSTALL sound/usb/snd-usb-audio.ko
> > >   INSTALL sound/usb/snd-usbmidi-lib.ko
> > >   INSTALL sound/xen/snd_xen_front.ko
> > >   DEPMOD  5.12.0-rc3-00009-g1fda33bf463d
> > > depmod: ERROR: Cycle detected: fwnode_mdio -> of_mdio -> fwnode_mdio
> > > depmod: ERROR: Found 2 modules in dependency cycles!
> > > ~~~
> > > 
> > > Kconfig can be found here:
> > > https://gist.github.com/daniel-thompson/6a7d224f3d3950ffa3f63f979b636474
> > > 
> > > This Kconfig file is for a highly modular kernel derived from the Debian
> > > 5.10 arm64 kernel config. I was not able to reproduce using the defconfig
> > > kernel for arm64.
> > > 
> > Thanks for catching this. I'm able to reproduce the issue and will fix it.
> > 
> > By the way, is there any integration tool/mechanism out there to which I can
> > submit the patch series and build for various possible configs like these?
> 
> Not sure which autotester would be most likely to pick this up.
> 
> This issue is slightly unusual because it broke the install rather then
> the build... and lots of people (including me) primarily run build
> tests ;-) .
> 
> Anyhow, I guess the best way to pick up module problems like this is
> going to be an `allmodconfig` build followed up with `rm -rf modtest;
> make modules_install INSTALL_MOD_PATH=$PWD/modtest`.

Thanks Daniel for the info.

To resolve this issue, I need to add more fwnode MDIO functions.
I'm working on these. Meanwhile, will separately send out two patches
that got Reviewed-by tag.

Regards
Calvin