next: Build error on arm64: `modpost: "of_find_next_cache_node" [drivers/cpufreq/qcom-cpufreq-nvmem.ko] undefined!`

[Thorsten Leemhuis]

Hi Dmitry, my linux-next builds for Fedora failed today with this error:

> + /usr/bin/make -s 'HOSTCFLAGS=-O2  -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -mbranch-protection=standard -fasynchronous-unwind-tables -fstack-clash-protection   ' 'HOSTLDFLAGS=-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -Wl,--build-id=sha1 -specs=/usr/lib/rpm/redhat/redhat-package-notes ' ARCH=arm64 'KCFLAGS= ' WITH_GCOV=0 -j4 modules
> drivers/net/ethernet/freescale/dpaa/dpaa_ethtool.c: In function 'dpaa_set_coalesce':
> drivers/net/ethernet/freescale/dpaa/dpaa_ethtool.c:502:1: warning: the frame size of 4112 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>   502 | }
>       | ^
> drivers/net/ethernet/freescale/dpaa/dpaa_eth.c: In function 'dpaa_fq_setup.constprop':
> drivers/net/ethernet/freescale/dpaa/dpaa_eth.c:1000:1: warning: the frame size of 8224 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>  1000 | }
>       | ^
> ERROR: modpost: "of_find_next_cache_node" [drivers/cpufreq/qcom-cpufreq-nvmem.ko] undefined!

A quick search on lore found that the 0-day bot encountered a similar
problem early July:
https://lore.kernel.org/all/202307030626.PUPpfATh-lkp@intel.com/

Back then it afaics was caused by "cpufreq: qcom-nvmem: create L2 cache
device" which is new in todays next, which makes it a likely suspect for
my problem. That's why I decided to write this mail. But note, I didn't
verify if that patch really causes the trouble; hence if you think it
might be something entirely different, let me know.

Full build log:
https://copr-be.cloud.fedoraproject.org/results/@kernel-vanilla/next/fedora-38-aarch64/06516038-next-next-all/builder-live.log.gz

I don't have the config file at hand, but it should be the following one
processed with "make olddefconfig"
https://www.leemhuis.info/files/misc/kernel-aarch64-fedora.config

Ciao, Thorsten