linux-kernel - Re: [PATCH] mm: memcg/slab: fix slab statistics in !SMP configuration

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Date:   Thu, 1 Oct 2020 17:55:59 -0700
From:   Roman Gushchin <guro@...com>
To:     kernel test robot <lkp@...el.com>
CC:     Linus Torvalds <torvalds@...ux-foundation.org>,
        <kbuild-all@...ts.01.org>, LKML <linux-kernel@...r.kernel.org>,
        Bastian Bittorf <bb@....de>, Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH] mm: memcg/slab: fix slab statistics in !SMP configuration

On Fri, Oct 02, 2020 at 08:08:40AM +0800, kbuild test robot wrote:
> Hi Roman,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on mmotm/master]

It's a bogus error, the patch was applied onto mmotm/master, which doesn't
contain necessary slab controller patches.

Thanks!

> 
> url:    https://github.com/0day-ci/linux/commits/Roman-Gushchin/mm-memcg-slab-fix-slab-statistics-in-SMP-configuration/20201002-044114
> base:   git://git.cmpxchg.org/linux-mmotm.git master
> config: i386-randconfig-s002-20200930 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.2-201-g24bdaac6-dirty
>         # https://github.com/0day-ci/linux/commit/3e4248734433fea1624e4971258042af2f231e02
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Roman-Gushchin/mm-memcg-slab-fix-slab-statistics-in-SMP-configuration/20201002-044114
>         git checkout 3e4248734433fea1624e4971258042af2f231e02
>         # save the attached .config to linux build tree
>         make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from include/linux/mm.h:1317,
>                     from include/linux/memcontrol.h:20,
>                     from include/linux/swap.h:9,
>                     from include/linux/suspend.h:5,
>                     from arch/x86/kernel/asm-offsets.c:13:
>    include/linux/vmstat.h: In function '__mod_node_page_state':
> >> include/linux/vmstat.h:295:6: error: implicit declaration of function 'vmstat_item_in_bytes' [-Werror=implicit-function-declaration]
>      295 |  if (vmstat_item_in_bytes(item)) {
>          |      ^~~~~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors
>    make[2]: *** [scripts/Makefile.build:99: arch/x86/kernel/asm-offsets.s] Error 1
>    make[2]: Target '__build' not remade because of errors.
>    make[1]: *** [Makefile:1139: prepare0] Error 2
>    make[1]: Target 'prepare' not remade because of errors.
>    make: *** [Makefile:179: sub-make] Error 2
>    make: Target 'prepare' not remade because of errors.
> 
> vim +/vmstat_item_in_bytes +295 include/linux/vmstat.h
> 
>    291	
>    292	static inline void __mod_node_page_state(struct pglist_data *pgdat,
>    293				enum node_stat_item item, int delta)
>    294	{
>  > 295		if (vmstat_item_in_bytes(item)) {
>    296			VM_WARN_ON_ONCE(delta & (PAGE_SIZE - 1));
>    297			delta >>= PAGE_SHIFT;
>    298		}
>    299	
>    300		node_page_state_add(delta, pgdat, item);
>    301	}
>    302	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.01.org_hyperkitty_list_kbuild-2Dall-40lists.01.org&d=DwIBAg&c=5VD0RTtNlTh3ycd41b3MUw&r=jJYgtDM7QT-W-Fz_d29HYQ&m=a91mqnAqjcA0iLpnhkpBXCmVqE_BuOIny-YmkB8jp2U&s=4EiiISKLS8YORtIb2rqP7oxVeqhBmKzMHqJzWhDAuMw&e=