Re: [PATCH V8 1/6] LIBIO: Introduce a generic PIO mapping method

kbuild test robot
2017-04-01T06:32:21Z

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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@redhat.com>
:::::: CC: Ingo Molnar <mingo@elte.hu>

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