linux-kernel - Re: [PATCH mm v2 6/9] memcg: enable accounting for percpu allocation of struct cgroup_rstat

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Date:   Sun, 22 May 2022 06:05:30 +0800
From:   kernel test robot <lkp@...el.com>
To:     Vasily Averin <vvs@...nvz.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        kernel@...nvz.org, linux-kernel@...r.kernel.org,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Michal Koutný <mkoutny@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH mm v2 6/9] memcg: enable accounting for percpu allocation
 of struct cgroup_rstat_cpu

Hi Vasily,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on tj-cgroup/for-next driver-core/driver-core-testing linus/master v5.18-rc7 next-20220520]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/intel-lab-lkp/linux/commits/Vasily-Averin/memcg-enable-accounting-for-struct-cgroup/20220522-004124
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 991d8d8142cad94f9c5c05db25e67fa83d6f772a
config: arm-imxrt_defconfig (https://download.01.org/0day-ci/archive/20220522/202205220531.AVnBFrgq-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.3.0
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
        # https://github.com/intel-lab-lkp/linux/commit/c1b7edf1635aaef50d25ba8246a5e5c997a6bf44
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Vasily-Averin/memcg-enable-accounting-for-struct-cgroup/20220522-004124
        git checkout c1b7edf1635aaef50d25ba8246a5e5c997a6bf44
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash kernel/cgroup/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   kernel/cgroup/rstat.c: In function 'cgroup_rstat_init':
>> kernel/cgroup/rstat.c:261:70: error: macro "alloc_percpu_gfp" requires 2 arguments, but only 1 given
     261 |                                                    GFP_KERNEL_ACCOUNT);
         |                                                                      ^
   In file included from include/linux/hrtimer.h:19,
                    from include/linux/sched.h:19,
                    from include/linux/cgroup.h:12,
                    from kernel/cgroup/cgroup-internal.h:5,
                    from kernel/cgroup/rstat.c:2:
   include/linux/percpu.h:133: note: macro "alloc_percpu_gfp" defined here
     133 | #define alloc_percpu_gfp(type, gfp)                                     \
         | 
>> kernel/cgroup/rstat.c:260:35: error: 'alloc_percpu_gfp' undeclared (first use in this function)
     260 |                 cgrp->rstat_cpu = alloc_percpu_gfp(struct cgroup_rstat_cpu
         |                                   ^~~~~~~~~~~~~~~~
   kernel/cgroup/rstat.c:260:35: note: each undeclared identifier is reported only once for each function it appears in


vim +/alloc_percpu_gfp +261 kernel/cgroup/rstat.c

   253	
   254	int cgroup_rstat_init(struct cgroup *cgrp)
   255	{
   256		int cpu;
   257	
   258		/* the root cgrp has rstat_cpu preallocated */
   259		if (!cgrp->rstat_cpu) {
 > 260			cgrp->rstat_cpu = alloc_percpu_gfp(struct cgroup_rstat_cpu
 > 261							   GFP_KERNEL_ACCOUNT);
   262			if (!cgrp->rstat_cpu)
   263				return -ENOMEM;
   264		}
   265	
   266		/* ->updated_children list is self terminated */
   267		for_each_possible_cpu(cpu) {
   268			struct cgroup_rstat_cpu *rstatc = cgroup_rstat_cpu(cgrp, cpu);
   269	
   270			rstatc->updated_children = cgrp;
   271			u64_stats_init(&rstatc->bsync);
   272		}
   273	
   274		return 0;
   275	}
   276	

-- 
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