linux-kernel - Re: [PATCH v5 1/5] mm: page_alloc: remain memblock_next_valid

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Date:   Mon, 2 Apr 2018 15:50:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jia He <hejianet@...il.com>
Cc:     kbuild-all@...org, Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Laura Abbott <labbott@...hat.com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Philip Derrin <philip@....systems>,
        Grygorii Strashko <grygorii.strashko@...aro.org>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>,
        James Morse <james.morse@....com>,
        Steve Capper <steve.capper@....com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Gioh Kim <gi-oh.kim@...fitbricks.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Kemi Wang <kemi.wang@...el.com>,
        Petr Tesarik <ptesarik@...e.com>,
        YASUAKI ISHIMATSU <yasu.isimatu@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Nikolay Borisov <nborisov@...e.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Daniel Vacek <neelx@...hat.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Jia He <hejianet@...il.com>,
        Jia He <jia.he@...-semitech.com>
Subject: Re: [PATCH v5 1/5] mm: page_alloc: remain memblock_next_valid_pfn()
 on arm and arm64

Hi Jia,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16 next-20180329]
[cannot apply to arm64/for-next/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jia-He/optimize-memblock_next_valid_pfn-and-early_pfn_valid-on-arm-and-arm64/20180402-131223
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/page_alloc.c: In function 'memmap_init_zone':
>> mm/page_alloc.c:5360:10: error: implicit declaration of function 'skip_to_last_invalid_pfn' [-Werror=implicit-function-declaration]
       pfn = skip_to_last_invalid_pfn(pfn);
             ^~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/skip_to_last_invalid_pfn +5360 mm/page_alloc.c

  5340	
  5341		if (highest_memmap_pfn < end_pfn - 1)
  5342			highest_memmap_pfn = end_pfn - 1;
  5343	
  5344		/*
  5345		 * Honor reservation requested by the driver for this ZONE_DEVICE
  5346		 * memory
  5347		 */
  5348		if (altmap && start_pfn == altmap->base_pfn)
  5349			start_pfn += altmap->reserve;
  5350	
  5351		for (pfn = start_pfn; pfn < end_pfn; pfn++) {
  5352			/*
  5353			 * There can be holes in boot-time mem_map[]s handed to this
  5354			 * function.  They do not exist on hotplugged memory.
  5355			 */
  5356			if (context != MEMMAP_EARLY)
  5357				goto not_early;
  5358	
  5359			if (!early_pfn_valid(pfn)) {
> 5360				pfn = skip_to_last_invalid_pfn(pfn);
  5361				continue;
  5362			}
  5363			if (!early_pfn_in_nid(pfn, nid))
  5364				continue;
  5365			if (!update_defer_init(pgdat, pfn, end_pfn, &nr_initialised))
  5366				break;
  5367	

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