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Date: Thu, 1 Jun 2017 00:56:55 +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 WARNING 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: x86_64-allyesdebian (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All warnings (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)));
^~~~~~~~~~~~~~~
--
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 +/rcu_dereference_protected +129 net//core/neighbour.c
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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