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Date: Thu, 1 Jun 2017 00:30:37 +0800
From: kbuild test robot <lkp@...el.com>
To: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc: kbuild-all@...org, netdev@...r.kernel.org,
sowmini.varadhan@...cle.com, davem@...emloft.net,
stephen@...workplumber.org
Subject: Re: [PATCH net-next] neigh: Really delete an arp/neigh entry on "ip
neigh delete" or "arp -d"
Hi Sowmini,
[auto build test ERROR on net-next/master]
url: https://github.com/0day-ci/linux/commits/Sowmini-Varadhan/neigh-Really-delete-an-arp-neigh-entry-on-ip-neigh-delete-or-arp-d/20170531-235737
config: i386-randconfig-a0-05311518 (attached as .config)
compiler: gcc-5 (Debian 5.4.1-2) 5.4.1 20160904
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All errors (new ones prefixed by >>):
In file included from include/linux/srcu.h:33:0,
from include/linux/notifier.h:15,
from include/linux/memory_hotplug.h:6,
from include/linux/mmzone.h:757,
from include/linux/gfp.h:5,
from include/linux/slab.h:14,
from net/core/neighbour.c:20:
net/core/neighbour.c: In function 'neigh_del':
>> net/core/neighbour.c:130:25: error: 'tbl' undeclared (first use in this function)
lockdep_is_held(&tbl->lock)));
^
include/linux/rcupdate.h:637:36: note: in definition of macro 'rcu_assign_pointer'
uintptr_t _r_a_p__v = (uintptr_t)(v); \
^
include/linux/rcupdate.h:587:2: note: in expansion of macro 'RCU_LOCKDEP_WARN'
RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
^
include/linux/rcupdate.h:751:2: note: in expansion of macro '__rcu_dereference_protected'
__rcu_dereference_protected((p), (c), __rcu)
^
net/core/neighbour.c:129:8: note: in expansion of macro 'rcu_dereference_protected'
rcu_dereference_protected(n->next,
^
net/core/neighbour.c:130:8: note: in expansion of macro 'lockdep_is_held'
lockdep_is_held(&tbl->lock)));
^
net/core/neighbour.c:130:25: note: each undeclared identifier is reported only once for each function it appears in
lockdep_is_held(&tbl->lock)));
^
include/linux/rcupdate.h:637:36: note: in definition of macro 'rcu_assign_pointer'
uintptr_t _r_a_p__v = (uintptr_t)(v); \
^
include/linux/rcupdate.h:587:2: note: in expansion of macro 'RCU_LOCKDEP_WARN'
RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
^
include/linux/rcupdate.h:751:2: note: in expansion of macro '__rcu_dereference_protected'
__rcu_dereference_protected((p), (c), __rcu)
^
net/core/neighbour.c:129:8: note: in expansion of macro 'rcu_dereference_protected'
rcu_dereference_protected(n->next,
^
net/core/neighbour.c:130:8: note: in expansion of macro 'lockdep_is_held'
lockdep_is_held(&tbl->lock)));
^
vim +/tbl +130 net/core/neighbour.c
14 * Vitaly E. Lavrov releasing NULL neighbor in neigh_add.
15 * Harald Welte Add neighbour cache statistics like rtstat
16 */
17
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
> 20 #include <linux/slab.h>
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/socket.h>
25 #include <linux/netdevice.h>
26 #include <linux/proc_fs.h>
27 #ifdef CONFIG_SYSCTL
28 #include <linux/sysctl.h>
29 #endif
30 #include <linux/times.h>
31 #include <net/net_namespace.h>
32 #include <net/neighbour.h>
33 #include <net/dst.h>
34 #include <net/sock.h>
35 #include <net/netevent.h>
36 #include <net/netlink.h>
37 #include <linux/rtnetlink.h>
38 #include <linux/random.h>
39 #include <linux/string.h>
40 #include <linux/log2.h>
41 #include <linux/inetdevice.h>
42 #include <net/addrconf.h>
43
44 #define DEBUG
45 #define NEIGH_DEBUG 1
46 #define neigh_dbg(level, fmt, ...) \
47 do { \
48 if (level <= NEIGH_DEBUG) \
49 pr_debug(fmt, ##__VA_ARGS__); \
50 } while (0)
51
52 #define PNEIGH_HASHMASK 0xF
53
54 static void neigh_timer_handler(unsigned long arg);
55 static void __neigh_notify(struct neighbour *n, int type, int flags,
56 u32 pid);
57 static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid);
58 static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
59
60 #ifdef CONFIG_PROC_FS
61 static const struct file_operations neigh_stat_seq_fops;
62 #endif
63
64 /*
65 Neighbour hash table buckets are protected with rwlock tbl->lock.
66
67 - All the scans/updates to hash buckets MUST be made under this lock.
68 - NOTHING clever should be made under this lock: no callbacks
69 to protocol backends, no attempts to send something to network.
70 It will result in deadlocks, if backend/driver wants to use neighbour
71 cache.
72 - If the entry requires some non-trivial actions, increase
73 its reference count and release table lock.
74
75 Neighbour entries are protected:
76 - with reference count.
77 - with rwlock neigh->lock
78
79 Reference count prevents destruction.
80
81 neigh->lock mainly serializes ll address data and its validity state.
82 However, the same lock is used to protect another entry fields:
83 - timer
84 - resolution queue
85
86 Again, nothing clever shall be made under neigh->lock,
87 the most complicated procedure, which we allow is dev->hard_header.
88 It is supposed, that dev->hard_header is simplistic and does
89 not make callbacks to neighbour tables.
90 */
91
92 static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb)
93 {
94 kfree_skb(skb);
95 return -ENETDOWN;
96 }
97
98 static void neigh_cleanup_and_release(struct neighbour *neigh)
99 {
100 if (neigh->parms->neigh_cleanup)
101 neigh->parms->neigh_cleanup(neigh);
102
103 __neigh_notify(neigh, RTM_DELNEIGH, 0, 0);
104 call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
105 neigh_release(neigh);
106 }
107
108 /*
109 * It is random distribution in the interval (1/2)*base...(3/2)*base.
110 * It corresponds to default IPv6 settings and is not overridable,
111 * because it is really reasonable choice.
112 */
113
114 unsigned long neigh_rand_reach_time(unsigned long base)
115 {
116 return base ? (prandom_u32() % base) + (base >> 1) : 0;
117 }
118 EXPORT_SYMBOL(neigh_rand_reach_time);
119
120
121 static bool neigh_del(struct neighbour *n, __u8 state,
122 struct neighbour __rcu **np)
123 {
124 bool retval = false;
125
126 write_lock(&n->lock);
127 if (atomic_read(&n->refcnt) == 1 && !(n->nud_state & state)) {
128 rcu_assign_pointer(*np,
129 rcu_dereference_protected(n->next,
> 130 lockdep_is_held(&tbl->lock)));
131 n->dead = 1;
132 retval = true;
133 }
---
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