linux-kernel - Re: [PATCH 3/3] mm: memcontrol: consolidate cgroup socket tracking

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Date:   Wed, 14 Sep 2016 15:17:14 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     Johannes Weiner <hannes@...xchg.org>, kbuild-all@...org,
        Tejun Heo <tj@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Michal Hocko <mhocko@...e.cz>,
        Vladimir Davydov <vdavydov@...tuozzo.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 3/3] mm: memcontrol: consolidate cgroup socket tracking

On Thu, 15 Sep 2016 13:34:24 +0800 kbuild test robot <lkp@...el.com> wrote:

> Hi Johannes,
> 
> [auto build test ERROR on net/master]
> [also build test ERROR on v4.8-rc6 next-20160914]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> [Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
> [Check https://git-scm.com/docs/git-format-patch for more information]
> 
> url:    https://github.com/0day-ci/linux/commits/Johannes-Weiner/mm-memcontrol-make-per-cpu-charge-cache-IRQ-safe-for-socket-accounting/20160915-035634
> config: m68k-sun3_defconfig (attached as .config)
> compiler: m68k-linux-gcc (GCC) 4.9.0
> reproduce:
>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         make.cross ARCH=m68k 
> 
> All errors (new ones prefixed by >>):
> 
>    net/built-in.o: In function `sk_alloc':
> >> (.text+0x4076): undefined reference to `mem_cgroup_sk_alloc'
>    net/built-in.o: In function `__sk_destruct':
> >> sock.c:(.text+0x457e): undefined reference to `mem_cgroup_sk_free'
>    net/built-in.o: In function `sk_clone_lock':
>    (.text+0x4f1c): undefined reference to `mem_cgroup_sk_alloc'

This?

--- a/mm/memcontrol.c~mm-memcontrol-consolidate-cgroup-socket-tracking-fix
+++ a/mm/memcontrol.c
@@ -5655,9 +5655,6 @@ void mem_cgroup_sk_alloc(struct sock *sk
 {
 	struct mem_cgroup *memcg;
 
-	if (!mem_cgroup_sockets_enabled)
-		return;
-
 	/*
 	 * Socket cloning can throw us here with sk_memcg already
 	 * filled. It won't however, necessarily happen from
--- a/net/core/sock.c~mm-memcontrol-consolidate-cgroup-socket-tracking-fix
+++ a/net/core/sock.c
@@ -1385,7 +1385,8 @@ static void sk_prot_free(struct proto *p
 	slab = prot->slab;
 
 	cgroup_sk_free(&sk->sk_cgrp_data);
-	mem_cgroup_sk_free(sk);
+	if (mem_cgroup_sockets_enabled)
+		mem_cgroup_sk_free(sk);
 	security_sk_free(sk);
 	if (slab != NULL)
 		kmem_cache_free(slab, sk);
@@ -1422,7 +1423,8 @@ struct sock *sk_alloc(struct net *net, i
 		sock_net_set(sk, net);
 		atomic_set(&sk->sk_wmem_alloc, 1);
 
-		mem_cgroup_sk_alloc(sk);
+		if (mem_cgroup_sockets_enabled)
+			mem_cgroup_sk_alloc(sk);
 		cgroup_sk_alloc(&sk->sk_cgrp_data);
 		sock_update_classid(&sk->sk_cgrp_data);
 		sock_update_netprioidx(&sk->sk_cgrp_data);
@@ -1569,7 +1571,8 @@ struct sock *sk_clone_lock(const struct
 		newsk->sk_incoming_cpu = raw_smp_processor_id();
 		atomic64_set(&newsk->sk_cookie, 0);
 
-		mem_cgroup_sk_alloc(newsk);
+		if (mem_cgroup_sockets_enabled)
+			mem_cgroup_sk_alloc(newsk);
 		cgroup_sk_alloc(&newsk->sk_cgrp_data);
 
 		/*
_