Hi Christophe,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 79dede78c0573618e3137d3d8cbf78c84e25fabd
commit: feb8e960d780e170e992a70491eec9dd68f4dbf2 powerpc/mm: Fix CONFIG_PPC_KUAP_DEBUG on PPC32
date: 2 weeks ago
config: powerpc-randconfig-r035-20200508 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout feb8e960d780e170e992a70491eec9dd68f4dbf2
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day GCC_VERSION=9.3.0 make.cross ARCH=powerpc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@xxxxxxxxx>