On Wed, 20 May 2020 03:43:55 +0800 kbuild test robot <lkp@xxxxxxxxx> wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8 > commit: aa3238a152d1646868ac81bee4eee08ba39594de [9340/10701] mm: free_area_init: allow defining max_zone_pfn in descending order > config: arc-randconfig-r011-20200519 (attached as .config) > compiler: arc-elf-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 aa3238a152d1646868ac81bee4eee08ba39594de > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > > All warnings (new ones prefixed by >>, old ones prefixed by <<): > > arch/arc/mm/init.c:39:13: warning: no previous prototype for 'arc_get_mem_sz' [-Wmissing-prototypes] > 39 | long __init arc_get_mem_sz(void) > | ^~~~~~~~~~~~~~ > >> arch/arc/mm/init.c:80:6: warning: no previous prototype for 'arch_has_descending_max_zone_pfns' [-Wmissing-prototypes] > 80 | bool arch_has_descending_max_zone_pfns(void) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > arch/arc/mm/init.c:91:13: warning: no previous prototype for 'setup_arch_memory' [-Wmissing-prototypes] Thanks. This should do it: --- a/include/linux/mm.h~mm-free_area_init-allow-defining-max_zone_pfn-in-descending-order-fix-2-fix +++ a/include/linux/mm.h @@ -2464,6 +2464,7 @@ extern void setup_per_cpu_pageset(void); extern int min_free_kbytes; extern int watermark_boost_factor; extern int watermark_scale_factor; +extern bool arch_has_descending_max_zone_pfns(void); /* nommu.c */ extern atomic_long_t mmap_pages_allocated; _
