Hi zhichang.yuan, [auto build test ERROR on linus/master] [also build test ERROR on v4.11-rc4 next-20170331] [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/zhichang-yuan/LIBIO-Introduce-a-generic-PIO-mapping-method/20170401-104801 config: m68k-m5475evb_defconfig (attached as .config) compiler: m68k-linux-gcc (GCC) 4.9.0 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/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 error/warnings (new ones prefixed by >>): lib/logic_pio.c:32:50: error: 'PIO_MAX_SECT' undeclared here (not in a function) static struct logic_pio_root logic_pio_root_list[PIO_MAX_SECT] = { ^ lib/logic_pio.c:52:3: error: 'PIO_CPU_MMIO' undeclared here (not in a function) [PIO_CPU_MMIO] = { ^ lib/logic_pio.c:52:2: error: array index in initializer not of integer type [PIO_CPU_MMIO] = { ^ lib/logic_pio.c:52:2: error: (near initialization for 'logic_pio_root_list') lib/logic_pio.c:53:3: error: field name not in record or union initializer .sec_head = LIST_HEAD_INIT(logic_pio_root_list[PIO_CPU_MMIO].sec_head), ^ lib/logic_pio.c:53:3: error: (near initialization for 'logic_pio_root_list') lib/logic_pio.c:54:3: error: field name not in record or union initializer .sec_min = PIO_SECT_MIN(PIO_CPU_MMIO), ^ lib/logic_pio.c:54:3: error: (near initialization for 'logic_pio_root_list') lib/logic_pio.c:54:3: error: implicit declaration of function 'PIO_SECT_MIN' [-Werror=implicit-function-declaration] lib/logic_pio.c:55:3: error: field name not in record or union initializer .sec_max = PIO_SECT_MAX(PIO_CPU_MMIO), ^ lib/logic_pio.c:55:3: error: (near initialization for 'logic_pio_root_list') lib/logic_pio.c:55:3: error: implicit declaration of function 'PIO_SECT_MAX' [-Werror=implicit-function-declaration] In file included from include/linux/list.h:8:0, from include/linux/kobject.h:20, from include/linux/of.h:21, from lib/logic_pio.c:18: lib/logic_pio.c: In function 'logic_pio_find_range_byaddr': >> include/linux/rculist.h:351:49: error: dereferencing pointer to incomplete type for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ include/linux/kernel.h:852:18: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/rculist.h:351:13: note: in expansion of macro 'list_entry_rcu' for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/kernel.h:852:48: warning: initialization from incompatible pointer type const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/rculist.h:277:2: note: in expansion of macro 'container_of' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:351:13: note: in expansion of macro 'list_entry_rcu' for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ >> include/linux/rculist.h:351:49: error: dereferencing pointer to incomplete type for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ include/linux/kernel.h:853:3: note: in definition of macro 'container_of' (type *)( (char *)__mptr - offsetof(type,member) );}) ^ include/linux/rculist.h:351:13: note: in expansion of macro 'list_entry_rcu' for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ In file included from include/linux/compiler.h:62:0, from include/uapi/linux/stddef.h:1, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/of.h:18, from lib/logic_pio.c:18: >> include/linux/rculist.h:351:49: error: dereferencing pointer to incomplete type for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ include/linux/compiler-gcc.h:161:21: note: in definition of macro '__compiler_offsetof' __builtin_offsetof(a, b) ^ include/linux/kernel.h:853:29: note: in expansion of macro 'offsetof' (type *)( (char *)__mptr - offsetof(type,member) );}) ^ include/linux/rculist.h:277:2: note: in expansion of macro 'container_of' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:351:13: note: in expansion of macro 'list_entry_rcu' for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ In file included from include/linux/pid.h:4:0, from include/linux/sched.h:13, from arch/m68k/include/asm/pgtable_mm.h:10, from arch/m68k/include/asm/pgtable.h:4, from include/linux/mm.h:68, from lib/logic_pio.c:20: include/linux/rculist.h:352:7: error: dereferencing pointer to incomplete type &pos->member != (head); \ ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ In file included from include/linux/list.h:8:0, from include/linux/kobject.h:20, from include/linux/of.h:21, from lib/logic_pio.c:18: include/linux/rculist.h:353:49: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:18: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:27: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:27: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/compiler.h:323:22: note: in expansion of macro '__READ_ONCE' #define READ_ONCE(x) __READ_ONCE(x, 1) ^ >> include/linux/compiler.h:574:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:27: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/compiler.h:323:22: note: in expansion of macro '__READ_ONCE' #define READ_ONCE(x) __READ_ONCE(x, 1) ^ >> include/linux/compiler.h:574:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:27: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/compiler.h:323:22: note: in expansion of macro '__READ_ONCE' #define READ_ONCE(x) __READ_ONCE(x, 1) ^ >> include/linux/compiler.h:574:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:27: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/compiler.h:323:22: note: in expansion of macro '__READ_ONCE' #define READ_ONCE(x) __READ_ONCE(x, 1) ^ >> include/linux/compiler.h:574:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:27: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/compiler.h:323:22: note: in expansion of macro '__READ_ONCE' #define READ_ONCE(x) __READ_ONCE(x, 1) ^ >> include/linux/compiler.h:574:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:27: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/kernel.h:852:48: warning: initialization makes pointer from integer without a cast const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/rculist.h:277:2: note: in expansion of macro 'container_of' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ include/linux/rculist.h:353:49: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/kernel.h:853:3: note: in definition of macro 'container_of' (type *)( (char *)__mptr - offsetof(type,member) );}) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ In file included from include/linux/compiler.h:62:0, from include/uapi/linux/stddef.h:1, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/of.h:18, from lib/logic_pio.c:18: include/linux/rculist.h:353:49: error: dereferencing pointer to incomplete type pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ include/linux/compiler-gcc.h:161:21: note: in definition of macro '__compiler_offsetof' __builtin_offsetof(a, b) ^ include/linux/kernel.h:853:29: note: in expansion of macro 'offsetof' (type *)( (char *)__mptr - offsetof(type,member) );}) ^ include/linux/rculist.h:277:2: note: in expansion of macro 'container_of' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:353:9: note: in expansion of macro 'list_entry_rcu' pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) ^ lib/logic_pio.c:77:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(range, &io_range_list, list) { ^ >> lib/logic_pio.c:78:13: error: dereferencing pointer to incomplete type if (!range->pio_peer) { ^ In file included from include/linux/kernel.h:13:0, from include/linux/list.h:8, from include/linux/kobject.h:20, from include/linux/of.h:21, from lib/logic_pio.c:18: lib/logic_pio.c:80:11: error: dereferencing pointer to incomplete type &range->hw_start); ^ include/linux/printk.h:303:37: note: in definition of macro 'pr_warning' printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__) ^ >> lib/logic_pio.c:79:4: note: in expansion of macro 'pr_warn' pr_warn("Invalid cpu addr node(%pa) in list!\n", ^ lib/logic_pio.c:83:12: error: dereferencing pointer to incomplete type if (range->fwnode != fwnode) ^ lib/logic_pio.c:86:21: error: dereferencing pointer to incomplete type if (start >= range->hw_start + range->size || ^ lib/logic_pio.c:86:39: error: dereferencing pointer to incomplete type if (start >= range->hw_start + range->size || ^ lib/logic_pio.c:87:15: error: dereferencing pointer to incomplete type end < range->hw_start) ^ lib/logic_pio.c:90:20: error: dereferencing pointer to incomplete type if (start < range->hw_start || ^ lib/logic_pio.c:91:16: error: dereferencing pointer to incomplete type end >= range->hw_start + range->size) ^ lib/logic_pio.c:91:34: error: dereferencing pointer to incomplete type end >= range->hw_start + range->size) ^ lib/logic_pio.c: In function 'logic_pio_alloc_range': lib/logic_pio.c:109:19: error: dereferencing pointer to incomplete type idle_start = root->sec_min; ^ lib/logic_pio.c:110:15: error: dereferencing pointer to incomplete type *prev = &root->sec_head; ^ In file included from include/linux/list.h:8:0, from include/linux/kobject.h:20, from include/linux/of.h:21, from lib/logic_pio.c:18: >> include/linux/rculist.h:351:49: error: dereferencing pointer to incomplete type for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ include/linux/kernel.h:852:18: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/rculist.h:351:13: note: in expansion of macro 'list_entry_rcu' for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ lib/logic_pio.c:111:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(entry, &root->sec_head, list) { ^ lib/logic_pio.c:111:38: error: dereferencing pointer to incomplete type list_for_each_entry_rcu(entry, &root->sec_head, list) { ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ >> include/linux/rculist.h:277:15: note: in expansion of macro 'lockless_dereference' container_of(lockless_dereference(ptr), type, member) ^ include/linux/rculist.h:351:13: note: in expansion of macro 'list_entry_rcu' for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ ^ lib/logic_pio.c:111:2: note: in expansion of macro 'list_for_each_entry_rcu' list_for_each_entry_rcu(entry, &root->sec_head, list) { ^ lib/logic_pio.c:111:38: error: dereferencing pointer to incomplete type list_for_each_entry_rcu(entry, &root->sec_head, list) { ^ include/linux/kernel.h:852:49: note: in definition of macro 'container_of' const typeof( ((type *)0)->member ) *__mptr = (ptr); \ ^ include/linux/compiler.h:323:22: note: in expansion of macro '__READ_ONCE' #define READ_ONCE(x) __READ_ONCE(x, 1) ^ >> include/linux/compiler.h:574:26: note: in expansion of macro 'READ_ONCE' typeof(p) _________p1 = READ_ONCE(p); \ ^ vim +351 include/linux/rculist.h 3943f42c Andrey Utkin 2014-11-14 271 * @member: the name of the list_head within the struct. 72c6a987 Jiri Pirko 2009-04-14 272 * 72c6a987 Jiri Pirko 2009-04-14 273 * This primitive may safely run concurrently with the _rcu list-mutation 72c6a987 Jiri Pirko 2009-04-14 274 * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock(). 72c6a987 Jiri Pirko 2009-04-14 275 */ 72c6a987 Jiri Pirko 2009-04-14 276 #define list_entry_rcu(ptr, type, member) \ 8db70b13 Patrick Marlier 2015-09-11 @277 container_of(lockless_dereference(ptr), type, member) 72c6a987 Jiri Pirko 2009-04-14 278 72c6a987 Jiri Pirko 2009-04-14 279 /** f88022a4 Michel Machado 2012-04-10 280 * Where are list_empty_rcu() and list_first_entry_rcu()? f88022a4 Michel Machado 2012-04-10 281 * f88022a4 Michel Machado 2012-04-10 282 * Implementing those functions following their counterparts list_empty() and f88022a4 Michel Machado 2012-04-10 283 * list_first_entry() is not advisable because they lead to subtle race f88022a4 Michel Machado 2012-04-10 284 * conditions as the following snippet shows: f88022a4 Michel Machado 2012-04-10 285 * f88022a4 Michel Machado 2012-04-10 286 * if (!list_empty_rcu(mylist)) { f88022a4 Michel Machado 2012-04-10 287 * struct foo *bar = list_first_entry_rcu(mylist, struct foo, list_member); f88022a4 Michel Machado 2012-04-10 288 * do_something(bar); f88022a4 Michel Machado 2012-04-10 289 * } f88022a4 Michel Machado 2012-04-10 290 * f88022a4 Michel Machado 2012-04-10 291 * The list may not be empty when list_empty_rcu checks it, but it may be when f88022a4 Michel Machado 2012-04-10 292 * list_first_entry_rcu rereads the ->next pointer. f88022a4 Michel Machado 2012-04-10 293 * f88022a4 Michel Machado 2012-04-10 294 * Rereading the ->next pointer is not a problem for list_empty() and f88022a4 Michel Machado 2012-04-10 295 * list_first_entry() because they would be protected by a lock that blocks f88022a4 Michel Machado 2012-04-10 296 * writers. f88022a4 Michel Machado 2012-04-10 297 * f88022a4 Michel Machado 2012-04-10 298 * See list_first_or_null_rcu for an alternative. f88022a4 Michel Machado 2012-04-10 299 */ f88022a4 Michel Machado 2012-04-10 300 f88022a4 Michel Machado 2012-04-10 301 /** f88022a4 Michel Machado 2012-04-10 302 * list_first_or_null_rcu - get the first element from a list 72c6a987 Jiri Pirko 2009-04-14 303 * @ptr: the list head to take the element from. 72c6a987 Jiri Pirko 2009-04-14 304 * @type: the type of the struct this is embedded in. 3943f42c Andrey Utkin 2014-11-14 305 * @member: the name of the list_head within the struct. 72c6a987 Jiri Pirko 2009-04-14 306 * f88022a4 Michel Machado 2012-04-10 307 * Note that if the list is empty, it returns NULL. 72c6a987 Jiri Pirko 2009-04-14 308 * 72c6a987 Jiri Pirko 2009-04-14 309 * This primitive may safely run concurrently with the _rcu list-mutation 72c6a987 Jiri Pirko 2009-04-14 310 * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock(). 72c6a987 Jiri Pirko 2009-04-14 311 */ f88022a4 Michel Machado 2012-04-10 312 #define list_first_or_null_rcu(ptr, type, member) \ 0adab9b9 Joe Perches 2013-12-05 313 ({ \ 0adab9b9 Joe Perches 2013-12-05 314 struct list_head *__ptr = (ptr); \ 7d0ae808 Paul E. McKenney 2015-03-03 315 struct list_head *__next = READ_ONCE(__ptr->next); \ 0adab9b9 Joe Perches 2013-12-05 316 likely(__ptr != __next) ? list_entry_rcu(__next, type, member) : NULL; \ f88022a4 Michel Machado 2012-04-10 317 }) 72c6a987 Jiri Pirko 2009-04-14 318 82524746 Franck Bui-Huu 2008-05-12 319 /** ff3c44e6 Tom Herbert 2016-03-07 320 * list_next_or_null_rcu - get the first element from a list ff3c44e6 Tom Herbert 2016-03-07 321 * @head: the head for the list. ff3c44e6 Tom Herbert 2016-03-07 322 * @ptr: the list head to take the next element from. ff3c44e6 Tom Herbert 2016-03-07 323 * @type: the type of the struct this is embedded in. ff3c44e6 Tom Herbert 2016-03-07 324 * @member: the name of the list_head within the struct. ff3c44e6 Tom Herbert 2016-03-07 325 * ff3c44e6 Tom Herbert 2016-03-07 326 * Note that if the ptr is at the end of the list, NULL is returned. ff3c44e6 Tom Herbert 2016-03-07 327 * ff3c44e6 Tom Herbert 2016-03-07 328 * This primitive may safely run concurrently with the _rcu list-mutation ff3c44e6 Tom Herbert 2016-03-07 329 * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock(). ff3c44e6 Tom Herbert 2016-03-07 330 */ ff3c44e6 Tom Herbert 2016-03-07 331 #define list_next_or_null_rcu(head, ptr, type, member) \ ff3c44e6 Tom Herbert 2016-03-07 332 ({ \ ff3c44e6 Tom Herbert 2016-03-07 333 struct list_head *__head = (head); \ ff3c44e6 Tom Herbert 2016-03-07 334 struct list_head *__ptr = (ptr); \ ff3c44e6 Tom Herbert 2016-03-07 335 struct list_head *__next = READ_ONCE(__ptr->next); \ ff3c44e6 Tom Herbert 2016-03-07 336 likely(__next != __head) ? list_entry_rcu(__next, type, \ ff3c44e6 Tom Herbert 2016-03-07 337 member) : NULL; \ ff3c44e6 Tom Herbert 2016-03-07 338 }) ff3c44e6 Tom Herbert 2016-03-07 339 ff3c44e6 Tom Herbert 2016-03-07 340 /** 82524746 Franck Bui-Huu 2008-05-12 341 * list_for_each_entry_rcu - iterate over rcu list of given type 82524746 Franck Bui-Huu 2008-05-12 342 * @pos: the type * to use as a loop cursor. 82524746 Franck Bui-Huu 2008-05-12 343 * @head: the head for your list. 3943f42c Andrey Utkin 2014-11-14 344 * @member: the name of the list_head within the struct. 82524746 Franck Bui-Huu 2008-05-12 345 * 82524746 Franck Bui-Huu 2008-05-12 346 * This list-traversal primitive may safely run concurrently with 82524746 Franck Bui-Huu 2008-05-12 347 * the _rcu list-mutation primitives such as list_add_rcu() 82524746 Franck Bui-Huu 2008-05-12 348 * as long as the traversal is guarded by rcu_read_lock(). 82524746 Franck Bui-Huu 2008-05-12 349 */ 82524746 Franck Bui-Huu 2008-05-12 350 #define list_for_each_entry_rcu(pos, head, member) \ 72c6a987 Jiri Pirko 2009-04-14 @351 for (pos = list_entry_rcu((head)->next, typeof(*pos), member); \ e66eed65 Linus Torvalds 2011-05-19 352 &pos->member != (head); \ 72c6a987 Jiri Pirko 2009-04-14 @353 pos = list_entry_rcu(pos->member.next, typeof(*pos), member)) 82524746 Franck Bui-Huu 2008-05-12 354 82524746 Franck Bui-Huu 2008-05-12 355 /** 69b90729 Alexey Kardashevskiy 2015-12-05 356 * list_entry_lockless - get the struct for this entry :::::: The code at line 351 was first introduced by commit :::::: 72c6a9870f901045f2464c3dc6ee8914bfdc07aa rculist.h: introduce list_entry_rcu() and list_first_entry_rcu() :::::: TO: Jiri Pirko <jpirko@xxxxxxxxxx> :::::: CC: Ingo Molnar <mingo@xxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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