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 } --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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