[linux-next:master 9340/10701] arch/arc/mm/init.c:80:6: warning: no previous prototype for 'arch_has_descending_max_zone_pfns'

[linux-next:master 9340/10701] arch/arc/mm/init.c:80:6: warning: no previous prototype for 'arch_has_descending_max_zone_pfns'

[kbuild test robot]

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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@intel.com>

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]
91 | void __init setup_arch_memory(void)
|             ^~~~~~~~~~~~~~~~~

vim +/arch_has_descending_max_zone_pfns +80 arch/arc/mm/init.c

    79	
  > 80	bool arch_has_descending_max_zone_pfns(void)
    81	{
    82		return true;
    83	}
    84	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [linux-next:master 9340/10701] arch/arc/mm/init.c:80:6: warning: no previous prototype for 'arch_has_descending_max_zone_pfns'

[Andrew Morton]

On Wed, 20 May 2020 03:43:55 +0800 kbuild test robot <lkp@intel.com> 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@intel.com>
> 
> 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;
_