Hi Davidlohr, [auto build test ERROR on tip/auto-latest] [also build test ERROR on v4.9 next-20161222] [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/Davidlohr-Bueso/sched-Introduce-rcuwait/20161223-020109 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 Note: the linux-review/Davidlohr-Bueso/sched-Introduce-rcuwait/20161223-020109 HEAD 9e9d238f94d5aa8e348e7e70585533fe0dbd373b builds fine. It only hurts bisectibility. All error/warnings (new ones prefixed by >>): >> kernel/exit.c:285:29: warning: 'struct rcuwait' declared inside parameter >> list void rcuwait_trywake(struct rcuwait *w) ^ >> kernel/exit.c:285:29: warning: its scope is only this definition or >> declaration, which is probably not what you want 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:751, from include/linux/gfp.h:5, from include/linux/mm.h:9, from kernel/exit.c:7: kernel/exit.c: In function 'rcuwait_trywake': >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/rcupdate.h:606:10: note: in definition of macro '__rcu_dereference_check' typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \ ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/rcupdate.h:606:36: note: in definition of macro '__rcu_dereference_check' typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \ ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ In file included from include/asm-generic/bug.h:4:0, from arch/m68k/include/asm/bug.h:28, from include/linux/bug.h:4, from include/linux/mmdebug.h:4, from include/linux/mm.h:8, from kernel/exit.c:7: >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/compiler.h:563:9: note: in definition of macro 'lockless_dereference' typeof(p) _________p1 = READ_ONCE(p); \ ^ include/linux/rcupdate.h:727:2: note: in expansion of macro '__rcu_dereference_check' __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ In file included from include/asm-generic/bug.h:4:0, from arch/m68k/include/asm/bug.h:28, from include/linux/bug.h:4, from include/linux/mmdebug.h:4, from include/linux/mm.h:8, from kernel/exit.c:7: >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/compiler.h:305:17: note: in definition of macro '__READ_ONCE' union { typeof(x) __val; char __c[1]; } __u; \ ^ >> include/linux/compiler.h:563:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rcupdate.h:606:48: note: in expansion of macro >> 'lockless_dereference' typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \ ^ include/linux/rcupdate.h:727:2: note: in expansion of macro '__rcu_dereference_check' __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/compiler.h:307:22: note: in definition of macro '__READ_ONCE' __read_once_size(&(x), __u.__c, sizeof(x)); \ ^ >> include/linux/compiler.h:563:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rcupdate.h:606:48: note: in expansion of macro >> 'lockless_dereference' typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \ ^ include/linux/rcupdate.h:727:2: note: in expansion of macro '__rcu_dereference_check' __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/compiler.h:307:42: note: in definition of macro '__READ_ONCE' __read_once_size(&(x), __u.__c, sizeof(x)); \ ^ >> include/linux/compiler.h:563:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rcupdate.h:606:48: note: in expansion of macro >> 'lockless_dereference' typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \ ^ include/linux/rcupdate.h:727:2: note: in expansion of macro '__rcu_dereference_check' __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/compiler.h:309:30: note: in definition of macro '__READ_ONCE' __read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \ ^ >> include/linux/compiler.h:563:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rcupdate.h:606:48: note: in expansion of macro >> 'lockless_dereference' typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \ ^ include/linux/rcupdate.h:727:2: note: in expansion of macro '__rcu_dereference_check' __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ >> kernel/exit.c:308:26: error: dereferencing pointer to incomplete type task = rcu_dereference(w->task); ^ include/linux/compiler.h:309:50: note: in definition of macro '__READ_ONCE' __read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \ ^ >> include/linux/compiler.h:563:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rcupdate.h:606:48: note: in expansion of macro >> 'lockless_dereference' typeof(*p) *________p1 = (typeof(*p) *__force)lockless_dereference(p); \ ^ include/linux/rcupdate.h:727:2: note: in expansion of macro '__rcu_dereference_check' __rcu_dereference_check((p), (c) || rcu_read_lock_held(), __rcu) ^ include/linux/rcupdate.h:786:28: note: in expansion of macro 'rcu_dereference_check' #define rcu_dereference(p) rcu_dereference_check(p, 0) ^ kernel/exit.c:308:9: note: in expansion of macro 'rcu_dereference' task = rcu_dereference(w->task); ^ In file included from include/asm-generic/bug.h:4:0, from arch/m68k/include/asm/bug.h:28, from include/linux/bug.h:4, from include/linux/mmdebug.h:4, from include/linux/mm.h:8, from kernel/exit.c:7: vim +308 kernel/exit.c 279 if (!sighand) 280 return NULL; 281 282 return task; 283 } 284 > 285 void rcuwait_trywake(struct rcuwait *w) 286 { 287 struct task_struct *task; 288 289 rcu_read_lock(); 290 291 /* 292 * Order condition vs @task, such that everything prior to the load 293 * of @task is visible. This is the condition as to why the user called 294 * rcuwait_trywake() in the first place. Pairs with set_current_state() 295 * barrier (A) in rcuwait_wait_event(). 296 * 297 * WAIT WAKE 298 * [S] tsk = current [S] cond = true 299 * MB (A) MB (B) 300 * [L] cond [L] tsk 301 */ 302 smp_rmb(); /* (B) */ 303 304 /* 305 * Avoid using task_rcu_dereference() magic as long as we are careful, 306 * see comment in rcuwait_wait_event() regarding ->exit_state. 307 */ > 308 task = rcu_dereference(w->task); 309 if (task) 310 wake_up_process(task); 311 rcu_read_unlock(); --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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