| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 4 Mar 2020 22:43:25 +0800
From: kbuild test robot <lkp@...el.com>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [rcu:dev.2020.02.29a 43/43] kernel/rcu/tasks.h:313:20: error:
'rcu_task_stall_timeout' undeclared
tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.02.29a
head: 61f7110d6b78f4c84ea5d5480185740840889af7
commit: 61f7110d6b78f4c84ea5d5480185740840889af7 [43/43] rcu-tasks: Add an RCU-tasks rude variant
config: nds32-allnoconfig (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 61f7110d6b78f4c84ea5d5480185740840889af7
# save the attached .config to linux build tree
GCC_VERSION=9.2.0 make.cross ARCH=nds32
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
213 | t->rcu_tasks_nvcsw != READ_ONCE(t->nvcsw) ||
| ^~
kernel/rcu/tasks.h:216:28: error: 'struct task_struct' has no member named 'rcu_tasks_idle_cpu'
216 | !is_idle_task(t) && t->rcu_tasks_idle_cpu >= 0)) {
| ^~
In file included from include/linux/kernel.h:11,
from kernel/rcu/update.c:21:
kernel/rcu/tasks.h:217:15: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
217 | WRITE_ONCE(t->rcu_tasks_holdout, false);
| ^~
include/linux/compiler.h:310:17: note: in definition of macro 'WRITE_ONCE'
310 | union { typeof(x) __val; char __c[1]; } __u = \
| ^
kernel/rcu/tasks.h:217:15: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
217 | WRITE_ONCE(t->rcu_tasks_holdout, false);
| ^~
include/linux/compiler.h:311:30: note: in definition of macro 'WRITE_ONCE'
311 | { .__val = (__force typeof(x)) (val) }; \
| ^
kernel/rcu/tasks.h:217:15: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
217 | WRITE_ONCE(t->rcu_tasks_holdout, false);
| ^~
include/linux/compiler.h:312:22: note: in definition of macro 'WRITE_ONCE'
312 | __write_once_size(&(x), __u.__c, sizeof(x)); \
| ^
kernel/rcu/tasks.h:217:15: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
217 | WRITE_ONCE(t->rcu_tasks_holdout, false);
| ^~
include/linux/compiler.h:312:42: note: in definition of macro 'WRITE_ONCE'
312 | __write_once_size(&(x), __u.__c, sizeof(x)); \
| ^
In file included from kernel/rcu/update.c:562:
kernel/rcu/tasks.h:218:19: error: 'struct task_struct' has no member named 'rcu_tasks_holdout_list'
218 | list_del_init(&t->rcu_tasks_holdout_list);
| ^~
In file included from include/linux/kernel.h:15,
from kernel/rcu/update.c:21:
kernel/rcu/tasks.h:233:5: error: 'struct task_struct' has no member named 'rcu_tasks_nvcsw'
233 | t->rcu_tasks_nvcsw, t->nvcsw, t->rcu_tasks_holdout,
| ^~
include/linux/printk.h:300:35: note: in definition of macro 'pr_alert'
300 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~~~~~~
kernel/rcu/tasks.h:233:35: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
233 | t->rcu_tasks_nvcsw, t->nvcsw, t->rcu_tasks_holdout,
| ^~
include/linux/printk.h:300:35: note: in definition of macro 'pr_alert'
300 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~~~~~~
kernel/rcu/tasks.h:234:5: error: 'struct task_struct' has no member named 'rcu_tasks_idle_cpu'
234 | t->rcu_tasks_idle_cpu, cpu);
| ^~
include/linux/printk.h:300:35: note: in definition of macro 'pr_alert'
300 | printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
| ^~~~~~~~~~~
In file included from kernel/rcu/update.c:562:
kernel/rcu/tasks.h: At top level:
kernel/rcu/tasks.h:239:38: warning: 'struct rcu_tasks' declared inside parameter list will not be visible outside of this definition or declaration
239 | static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
| ^~~~~~~~~
kernel/rcu/tasks.h: In function 'rcu_tasks_wait_gp':
kernel/rcu/tasks.h:271:5: error: 'struct task_struct' has no member named 'rcu_tasks_nvcsw'
271 | t->rcu_tasks_nvcsw = READ_ONCE(t->nvcsw);
| ^~
In file included from include/linux/kernel.h:11,
from kernel/rcu/update.c:21:
kernel/rcu/tasks.h:272:16: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
272 | WRITE_ONCE(t->rcu_tasks_holdout, true);
| ^~
include/linux/compiler.h:310:17: note: in definition of macro 'WRITE_ONCE'
310 | union { typeof(x) __val; char __c[1]; } __u = \
| ^
kernel/rcu/tasks.h:272:16: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
272 | WRITE_ONCE(t->rcu_tasks_holdout, true);
| ^~
include/linux/compiler.h:311:30: note: in definition of macro 'WRITE_ONCE'
311 | { .__val = (__force typeof(x)) (val) }; \
| ^
kernel/rcu/tasks.h:272:16: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
272 | WRITE_ONCE(t->rcu_tasks_holdout, true);
| ^~
include/linux/compiler.h:312:22: note: in definition of macro 'WRITE_ONCE'
312 | __write_once_size(&(x), __u.__c, sizeof(x)); \
| ^
kernel/rcu/tasks.h:272:16: error: 'struct task_struct' has no member named 'rcu_tasks_holdout'
272 | WRITE_ONCE(t->rcu_tasks_holdout, true);
| ^~
include/linux/compiler.h:312:42: note: in definition of macro 'WRITE_ONCE'
312 | __write_once_size(&(x), __u.__c, sizeof(x)); \
| ^
In file included from kernel/rcu/update.c:562:
kernel/rcu/tasks.h:273:15: error: 'struct task_struct' has no member named 'rcu_tasks_holdout_list'
273 | list_add(&t->rcu_tasks_holdout_list,
| ^~
kernel/rcu/tasks.h:286:20: error: 'tasks_rcu_exit_srcu' undeclared (first use in this function)
286 | synchronize_srcu(&tasks_rcu_exit_srcu);
| ^~~~~~~~~~~~~~~~~~~
kernel/rcu/tasks.h:286:20: note: each undeclared identifier is reported only once for each function it appears in
In file included from include/linux/kernel.h:11,
from kernel/rcu/update.c:21:
>> kernel/rcu/tasks.h:313:20: error: 'rcu_task_stall_timeout' undeclared (first use in this function)
313 | rtst = READ_ONCE(rcu_task_stall_timeout);
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:285:17: note: in definition of macro '__READ_ONCE'
285 | union { typeof(x) __val; char __c[1]; } __u; \
| ^
kernel/rcu/tasks.h:313:10: note: in expansion of macro 'READ_ONCE'
313 | rtst = READ_ONCE(rcu_task_stall_timeout);
| ^~~~~~~~~
include/linux/kernel.h:987:51: error: 'struct task_struct' has no member named 'rcu_tasks_holdout_list'
987 | BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
| ^~
include/linux/compiler.h:374:9: note: in definition of macro '__compiletime_assert'
374 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler.h:394:2: note: in expansion of macro '_compiletime_assert'
394 | _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
| ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
include/linux/kernel.h:987:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
987 | BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
| ^~~~~~~~~~~~~~~~
include/linux/kernel.h:987:20: note: in expansion of macro '__same_type'
987 | BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
| ^~~~~~~~~~~
include/linux/list.h:493:2: note: in expansion of macro 'container_of'
493 | container_of(ptr, type, member)
| ^~~~~~~~~~~~
include/linux/list.h:504:2: note: in expansion of macro 'list_entry'
504 | list_entry((ptr)->next, type, member)
| ^~~~~~~~~~
include/linux/list.h:688:13: note: in expansion of macro 'list_first_entry'
688 | for (pos = list_first_entry(head, typeof(*pos), member), \
| ^~~~~~~~~~~~~~~~
kernel/rcu/tasks.h:319:3: note: in expansion of macro 'list_for_each_entry_safe'
319 | list_for_each_entry_safe(t, t1, &rcu_tasks_holdouts,
| ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from <command-line>:
include/linux/compiler_types.h:129:35: error: 'struct task_struct' has no member named 'rcu_tasks_holdout_list'
129 | #define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
| ^~~~~~~~~~~~~~~~~~
include/linux/stddef.h:17:32: note: in expansion of macro '__compiler_offsetof'
17 | #define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
| ^~~~~~~~~~~~~~~~~~~
include/linux/kernel.h:990:21: note: in expansion of macro 'offsetof'
990 | ((type *)(__mptr - offsetof(type, member))); })
| ^~~~~~~~
include/linux/list.h:493:2: note: in expansion of macro 'container_of'
493 | container_of(ptr, type, member)
| ^~~~~~~~~~~~
include/linux/list.h:504:2: note: in expansion of macro 'list_entry'
504 | list_entry((ptr)->next, type, member)
| ^~~~~~~~~~
include/linux/list.h:688:13: note: in expansion of macro 'list_first_entry'
688 | for (pos = list_first_entry(head, typeof(*pos), member), \
| ^~~~~~~~~~~~~~~~
kernel/rcu/tasks.h:319:3: note: in expansion of macro 'list_for_each_entry_safe'
319 | list_for_each_entry_safe(t, t1, &rcu_tasks_holdouts,
| ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from kernel/rcu/update.c:21:
include/linux/list.h:537:18: error: 'struct task_struct' has no member named 'rcu_tasks_holdout_list'
537 | list_entry((pos)->member.next, typeof(*(pos)), member)
| ^~
include/linux/kernel.h:986:26: note: in definition of macro 'container_of'
986 | void *__mptr = (void *)(ptr); \
| ^~~
include/linux/list.h:537:2: note: in expansion of macro 'list_entry'
537 | list_entry((pos)->member.next, typeof(*(pos)), member)
| ^~~~~~~~~~
include/linux/list.h:689:7: note: in expansion of macro 'list_next_entry'
689 | n = list_next_entry(pos, member); \
| ^~~~~~~~~~~~~~~
kernel/rcu/tasks.h:319:3: note: in expansion of macro 'list_for_each_entry_safe'
319 | list_for_each_entry_safe(t, t1, &rcu_tasks_holdouts,
| ^~~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/kernel.h:11,
from kernel/rcu/update.c:21:
include/linux/list.h:537:18: error: 'struct task_struct' has no member named 'rcu_tasks_holdout_list'
537 | list_entry((pos)->member.next, typeof(*(pos)), member)
| ^~
include/linux/compiler.h:374:9: note: in definition of macro '__compiletime_assert'
374 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler.h:394:2: note: in expansion of macro '_compiletime_assert'
394 | _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
| ^~~~~~~~~~~~~~~~~~~
include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
include/linux/kernel.h:987:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
987 | BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
| ^~~~~~~~~~~~~~~~
include/linux/kernel.h:987:20: note: in expansion of macro '__same_type'
987 | BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \
| ^~~~~~~~~~~
include/linux/list.h:493:2: note: in expansion of macro 'container_of'
493 | container_of(ptr, type, member)
| ^~~~~~~~~~~~
include/linux/list.h:537:2: note: in expansion of macro 'list_entry'
vim +/rcu_task_stall_timeout +313 kernel/rcu/tasks.h
6b80543d90000c Paul E. McKenney 2020-03-02 237
61f7110d6b78f4 Paul E. McKenney 2020-03-02 238 /* Wait for one RCU-tasks grace period. */
61f7110d6b78f4 Paul E. McKenney 2020-03-02 239 static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
6b80543d90000c Paul E. McKenney 2020-03-02 240 {
6b80543d90000c Paul E. McKenney 2020-03-02 241 struct task_struct *g, *t;
6b80543d90000c Paul E. McKenney 2020-03-02 242 unsigned long lastreport;
6b80543d90000c Paul E. McKenney 2020-03-02 243 LIST_HEAD(rcu_tasks_holdouts);
6b80543d90000c Paul E. McKenney 2020-03-02 244 int fract;
6b80543d90000c Paul E. McKenney 2020-03-02 245
6b80543d90000c Paul E. McKenney 2020-03-02 246 /*
61f7110d6b78f4 Paul E. McKenney 2020-03-02 247 * Wait for all pre-existing t->on_rq and t->nvcsw transitions
61f7110d6b78f4 Paul E. McKenney 2020-03-02 248 * to complete. Invoking synchronize_rcu() suffices because all
61f7110d6b78f4 Paul E. McKenney 2020-03-02 249 * these transitions occur with interrupts disabled. Without this
61f7110d6b78f4 Paul E. McKenney 2020-03-02 250 * synchronize_rcu(), a read-side critical section that started
61f7110d6b78f4 Paul E. McKenney 2020-03-02 251 * before the grace period might be incorrectly seen as having
61f7110d6b78f4 Paul E. McKenney 2020-03-02 252 * started after the grace period.
6b80543d90000c Paul E. McKenney 2020-03-02 253 *
61f7110d6b78f4 Paul E. McKenney 2020-03-02 254 * This synchronize_rcu() also dispenses with the need for a
61f7110d6b78f4 Paul E. McKenney 2020-03-02 255 * memory barrier on the first store to t->rcu_tasks_holdout,
61f7110d6b78f4 Paul E. McKenney 2020-03-02 256 * as it forces the store to happen after the beginning of the
61f7110d6b78f4 Paul E. McKenney 2020-03-02 257 * grace period.
6b80543d90000c Paul E. McKenney 2020-03-02 258 */
6b80543d90000c Paul E. McKenney 2020-03-02 259 synchronize_rcu();
6b80543d90000c Paul E. McKenney 2020-03-02 260
6b80543d90000c Paul E. McKenney 2020-03-02 261 /*
61f7110d6b78f4 Paul E. McKenney 2020-03-02 262 * There were callbacks, so we need to wait for an RCU-tasks
61f7110d6b78f4 Paul E. McKenney 2020-03-02 263 * grace period. Start off by scanning the task list for tasks
61f7110d6b78f4 Paul E. McKenney 2020-03-02 264 * that are not already voluntarily blocked. Mark these tasks
61f7110d6b78f4 Paul E. McKenney 2020-03-02 265 * and make a list of them in rcu_tasks_holdouts.
6b80543d90000c Paul E. McKenney 2020-03-02 266 */
6b80543d90000c Paul E. McKenney 2020-03-02 267 rcu_read_lock();
6b80543d90000c Paul E. McKenney 2020-03-02 268 for_each_process_thread(g, t) {
61f7110d6b78f4 Paul E. McKenney 2020-03-02 269 if (t != current && READ_ONCE(t->on_rq) && !is_idle_task(t)) {
6b80543d90000c Paul E. McKenney 2020-03-02 270 get_task_struct(t);
6b80543d90000c Paul E. McKenney 2020-03-02 271 t->rcu_tasks_nvcsw = READ_ONCE(t->nvcsw);
6b80543d90000c Paul E. McKenney 2020-03-02 272 WRITE_ONCE(t->rcu_tasks_holdout, true);
6b80543d90000c Paul E. McKenney 2020-03-02 @273 list_add(&t->rcu_tasks_holdout_list,
6b80543d90000c Paul E. McKenney 2020-03-02 274 &rcu_tasks_holdouts);
6b80543d90000c Paul E. McKenney 2020-03-02 275 }
6b80543d90000c Paul E. McKenney 2020-03-02 276 }
6b80543d90000c Paul E. McKenney 2020-03-02 277 rcu_read_unlock();
6b80543d90000c Paul E. McKenney 2020-03-02 278
6b80543d90000c Paul E. McKenney 2020-03-02 279 /*
61f7110d6b78f4 Paul E. McKenney 2020-03-02 280 * Wait for tasks that are in the process of exiting. This
61f7110d6b78f4 Paul E. McKenney 2020-03-02 281 * does only part of the job, ensuring that all tasks that were
61f7110d6b78f4 Paul E. McKenney 2020-03-02 282 * previously exiting reach the point where they have disabled
61f7110d6b78f4 Paul E. McKenney 2020-03-02 283 * preemption, allowing the later synchronize_rcu() to finish
61f7110d6b78f4 Paul E. McKenney 2020-03-02 284 * the job.
6b80543d90000c Paul E. McKenney 2020-03-02 285 */
6b80543d90000c Paul E. McKenney 2020-03-02 286 synchronize_srcu(&tasks_rcu_exit_srcu);
6b80543d90000c Paul E. McKenney 2020-03-02 287
6b80543d90000c Paul E. McKenney 2020-03-02 288 /*
61f7110d6b78f4 Paul E. McKenney 2020-03-02 289 * Each pass through the following loop scans the list of holdout
61f7110d6b78f4 Paul E. McKenney 2020-03-02 290 * tasks, removing any that are no longer holdouts. When the list
61f7110d6b78f4 Paul E. McKenney 2020-03-02 291 * is empty, we are done.
6b80543d90000c Paul E. McKenney 2020-03-02 292 */
6b80543d90000c Paul E. McKenney 2020-03-02 293 lastreport = jiffies;
6b80543d90000c Paul E. McKenney 2020-03-02 294
61f7110d6b78f4 Paul E. McKenney 2020-03-02 295 /* Start off with HZ/10 wait and slowly back off to 1 HZ wait. */
6b80543d90000c Paul E. McKenney 2020-03-02 296 fract = 10;
6b80543d90000c Paul E. McKenney 2020-03-02 297
6b80543d90000c Paul E. McKenney 2020-03-02 298 for (;;) {
6b80543d90000c Paul E. McKenney 2020-03-02 299 bool firstreport;
6b80543d90000c Paul E. McKenney 2020-03-02 300 bool needreport;
6b80543d90000c Paul E. McKenney 2020-03-02 301 int rtst;
6b80543d90000c Paul E. McKenney 2020-03-02 302 struct task_struct *t1;
6b80543d90000c Paul E. McKenney 2020-03-02 303
6b80543d90000c Paul E. McKenney 2020-03-02 304 if (list_empty(&rcu_tasks_holdouts))
6b80543d90000c Paul E. McKenney 2020-03-02 305 break;
6b80543d90000c Paul E. McKenney 2020-03-02 306
6b80543d90000c Paul E. McKenney 2020-03-02 307 /* Slowly back off waiting for holdouts */
6b80543d90000c Paul E. McKenney 2020-03-02 308 schedule_timeout_interruptible(HZ/fract);
6b80543d90000c Paul E. McKenney 2020-03-02 309
6b80543d90000c Paul E. McKenney 2020-03-02 310 if (fract > 1)
6b80543d90000c Paul E. McKenney 2020-03-02 311 fract--;
6b80543d90000c Paul E. McKenney 2020-03-02 312
6b80543d90000c Paul E. McKenney 2020-03-02 @313 rtst = READ_ONCE(rcu_task_stall_timeout);
61f7110d6b78f4 Paul E. McKenney 2020-03-02 314 needreport = rtst > 0 && time_after(jiffies, lastreport + rtst);
6b80543d90000c Paul E. McKenney 2020-03-02 315 if (needreport)
6b80543d90000c Paul E. McKenney 2020-03-02 316 lastreport = jiffies;
6b80543d90000c Paul E. McKenney 2020-03-02 317 firstreport = true;
6b80543d90000c Paul E. McKenney 2020-03-02 318 WARN_ON(signal_pending(current));
6b80543d90000c Paul E. McKenney 2020-03-02 319 list_for_each_entry_safe(t, t1, &rcu_tasks_holdouts,
6b80543d90000c Paul E. McKenney 2020-03-02 320 rcu_tasks_holdout_list) {
6b80543d90000c Paul E. McKenney 2020-03-02 321 check_holdout_task(t, needreport, &firstreport);
6b80543d90000c Paul E. McKenney 2020-03-02 322 cond_resched();
6b80543d90000c Paul E. McKenney 2020-03-02 323 }
6b80543d90000c Paul E. McKenney 2020-03-02 324 }
6b80543d90000c Paul E. McKenney 2020-03-02 325
6b80543d90000c Paul E. McKenney 2020-03-02 326 /*
61f7110d6b78f4 Paul E. McKenney 2020-03-02 327 * Because ->on_rq and ->nvcsw are not guaranteed to have a full
61f7110d6b78f4 Paul E. McKenney 2020-03-02 328 * memory barriers prior to them in the schedule() path, memory
61f7110d6b78f4 Paul E. McKenney 2020-03-02 329 * reordering on other CPUs could cause their RCU-tasks read-side
61f7110d6b78f4 Paul E. McKenney 2020-03-02 330 * critical sections to extend past the end of the grace period.
61f7110d6b78f4 Paul E. McKenney 2020-03-02 331 * However, because these ->nvcsw updates are carried out with
61f7110d6b78f4 Paul E. McKenney 2020-03-02 332 * interrupts disabled, we can use synchronize_rcu() to force the
61f7110d6b78f4 Paul E. McKenney 2020-03-02 333 * needed ordering on all such CPUs.
6b80543d90000c Paul E. McKenney 2020-03-02 334 *
61f7110d6b78f4 Paul E. McKenney 2020-03-02 335 * This synchronize_rcu() also confines all ->rcu_tasks_holdout
61f7110d6b78f4 Paul E. McKenney 2020-03-02 336 * accesses to be within the grace period, avoiding the need for
61f7110d6b78f4 Paul E. McKenney 2020-03-02 337 * memory barriers for ->rcu_tasks_holdout accesses.
6b80543d90000c Paul E. McKenney 2020-03-02 338 *
61f7110d6b78f4 Paul E. McKenney 2020-03-02 339 * In addition, this synchronize_rcu() waits for exiting tasks
61f7110d6b78f4 Paul E. McKenney 2020-03-02 340 * to complete their final preempt_disable() region of execution,
61f7110d6b78f4 Paul E. McKenney 2020-03-02 341 * cleaning up after the synchronize_srcu() above.
6b80543d90000c Paul E. McKenney 2020-03-02 342 */
6b80543d90000c Paul E. McKenney 2020-03-02 343 synchronize_rcu();
61f7110d6b78f4 Paul E. McKenney 2020-03-02 344 }
6b80543d90000c Paul E. McKenney 2020-03-02 345
:::::: The code at line 313 was first introduced by commit
:::::: 6b80543d90000c684123b05f075ac1433d99fa85 tasks-rcu: Move Tasks RCU to its own file
:::::: TO: Paul E. McKenney <paulmck@...nel.org>
:::::: CC: Paul E. McKenney <paulmck@...nel.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
Download attachment ".config.gz" of type "application/gzip" (5248 bytes)
Powered by blists - more mailing lists