linux-kernel - Re: [PATCH 3/3] fs: fsnotify: account fsnotify metadata to kmemcg

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Date:   Wed, 21 Feb 2018 09:25:09 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     kbuild-all@...org, Jan Kara <jack@...e.cz>,
        Amir Goldstein <amir73il@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Thelen <gthelen@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH 3/3] fs: fsnotify: account fsnotify metadata to kmemcg

Hi Shakeel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on next-20180220]
[cannot apply to linus/master v4.16-rc2]
[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/Shakeel-Butt/Directed-kmem-charging/20180221-071026
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-n0-201807 (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 >>):

   init/initramfs.o: In function `kmalloc_memcg':
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   arch/x86/events/core.o: In function `kmalloc_memcg':
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   arch/x86/kernel/ksysfs.o: In function `kmalloc_memcg':
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   arch/x86/kernel/e820.o:include/linux/slab.h:588: more undefined references to `__kmalloc_memcg' follow
   fs/notify/fanotify/fanotify.o: In function `fanotify_alloc_event':
>> fs/notify/fanotify/fanotify.c:159: undefined reference to `kmem_cache_alloc_memcg'
   fs/eventpoll.o: In function `kmalloc_memcg':
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   fs/signalfd.o: In function `kmalloc_memcg':
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   fs/timerfd.o: In function `kmalloc_memcg':
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   fs/eventfd.o: In function `kmalloc_memcg':
   include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   fs/userfaultfd.o:include/linux/slab.h:588: more undefined references to `__kmalloc_memcg' follow

vim +159 fs/notify/fanotify/fanotify.c

   141	
   142	struct fanotify_event_info *fanotify_alloc_event(struct inode *inode, u32 mask,
   143							 const struct path *path,
   144							 struct mem_cgroup *memcg)
   145	{
   146		struct fanotify_event_info *event;
   147	
   148		if (fanotify_is_perm_event(mask)) {
   149			struct fanotify_perm_event_info *pevent;
   150	
   151			pevent = kmem_cache_alloc_memcg(fanotify_perm_event_cachep,
   152							GFP_KERNEL, memcg);
   153			if (!pevent)
   154				return NULL;
   155			event = &pevent->fae;
   156			pevent->response = 0;
   157			goto init;
   158		}
 > 159		event = kmem_cache_alloc_memcg(fanotify_event_cachep, GFP_KERNEL,
   160					       memcg);
   161		if (!event)
   162			return NULL;
   163	init: __maybe_unused
   164		fsnotify_init_event(&event->fse, inode, mask);
   165		event->tgid = get_pid(task_tgid(current));
   166		if (path) {
   167			event->path = *path;
   168			path_get(&event->path);
   169		} else {
   170			event->path.mnt = NULL;
   171			event->path.dentry = NULL;
   172		}
   173		return event;
   174	}
   175	

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