Hi bo, FYI, the error/warning still remains. tree: https://github.com/intel/linux-intel-lts.git 4.19/android_q head: 650dfa025a4c0789c39b69f3056bc9471eaa191e commit: ab2f796a9d1298c6e238cd2a770cbf3666393c02 [9364/17532] ion: fix the tons of warning from PAT config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout ab2f796a9d1298c6e238cd2a770cbf3666393c02 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from arch/powerpc/include/asm/book3s/64/mmu-hash.h:24, from arch/powerpc/include/asm/book3s/64/mmu.h:30, from arch/powerpc/include/asm/mmu.h:313, from arch/powerpc/include/asm/lppaca.h:36, from arch/powerpc/include/asm/paca.h:21, from arch/powerpc/include/asm/current.h:16, from include/linux/mutex.h:14, from include/linux/kernfs.h:13, from include/linux/sysfs.h:16, from include/linux/kobject.h:20, from include/linux/device.h:16, from include/linux/dma-mapping.h:7, from drivers/staging/android/ion/ion_system_heap.c:9: arch/powerpc/include/asm/book3s/64/pgtable.h:1275:15: warning: type qualifiers ignored on function return type [-Wignored-qualifiers] 1275 | static inline const int pud_pfn(pud_t pud) | ^~~~~ 17 | #include <asm/set_memory.h> | ^~~~~~~~~~~~~~~~~~ compilation terminated. # https://github.com/intel/linux-intel-lts/commit/ab2f796a9d1298c6e238cd2a7... git remote add intel-linux-intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-linux-intel-lts 4.19/android_q git checkout ab2f796a9d1298c6e238cd2a770cbf3666393c02 vim +17 drivers/staging/android/ion/ion_system_heap.c 18 #include "ion.h" 19 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org