[mingo-tip:sched/headers 1471/2384] include/linux/rcupdate.h:380:9: error: dereferencing pointer to incomplete type 'struct task_struct'
From: kernel test robot
Date: Mon Jan 24 2022 - 18:29:42 EST
Hi Ingo,
FYI, the error/warning still remains.
tree: git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head: 4c707c1c0de83967079b4e385012fa5b00e2cd11
commit: 2343c4a8035421263b16ea777e945cc1b0cbd22f [1471/2384] headers/deps: rcu/wait: Remove <linux/sched/task_flags.h> from <linux/rcuwait.h>
config: i386-randconfig-a002-20220124 (https://download.01.org/0day-ci/archive/20220125/202201250610.CvFrmXWz-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=2343c4a8035421263b16ea777e945cc1b0cbd22f
git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
git fetch --no-tags mingo-tip sched/headers
git checkout 2343c4a8035421263b16ea777e945cc1b0cbd22f
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All errors (new ones prefixed by >>):
In file included from include/linux/mm_types.h:16,
from include/asm-generic/fixmap.h:19,
from arch/x86/include/asm/fixmap.h:192,
from arch/x86/include/asm/apic.h:13,
from arch/x86/kernel/apic/hw_nmi.c:15:
include/linux/rcuwait.h: In function 'rcuwait_active':
>> include/linux/rcupdate.h:380:9: error: dereferencing pointer to incomplete type 'struct task_struct'
380 | typeof(*p) *_________p1 = (typeof(*p) *__force)READ_ONCE(p); \
| ^
include/linux/rcupdate.h:490:31: note: in expansion of macro '__rcu_access_pointer'
490 | #define rcu_access_pointer(p) __rcu_access_pointer((p), __rcu)
| ^~~~~~~~~~~~~~~~~~~~
include/linux/rcuwait.h:33:11: note: in expansion of macro 'rcu_access_pointer'
33 | return !!rcu_access_pointer(w->task);
| ^~~~~~~~~~~~~~~~~~
--
In file included from include/linux/workqueue.h:16,
from include/linux/workqueue_api.h:2,
from arch/x86/kvm/lapic.c:19:
include/linux/rcuwait.h: In function 'rcuwait_active':
>> include/linux/rcupdate.h:380:9: error: dereferencing pointer to incomplete type 'struct task_struct'
380 | typeof(*p) *_________p1 = (typeof(*p) *__force)READ_ONCE(p); \
| ^
include/linux/rcupdate.h:490:31: note: in expansion of macro '__rcu_access_pointer'
490 | #define rcu_access_pointer(p) __rcu_access_pointer((p), __rcu)
| ^~~~~~~~~~~~~~~~~~~~
include/linux/rcuwait.h:33:11: note: in expansion of macro 'rcu_access_pointer'
33 | return !!rcu_access_pointer(w->task);
| ^~~~~~~~~~~~~~~~~~
In file included from include/linux/rcuwait_api.h:1,
from arch/x86/kvm/lapic.c:20:
include/linux/rcuwait.h:34:1: error: control reaches end of non-void function [-Werror=return-type]
34 | }
| ^
cc1: some warnings being treated as errors
vim +380 include/linux/rcupdate.h
76c8eaafe4f061 Paul E. McKenney 2021-04-21 377
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 378 #define __rcu_access_pointer(p, space) \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 379 ({ \
7d0ae8086b8283 Paul E. McKenney 2015-03-03 @380 typeof(*p) *_________p1 = (typeof(*p) *__force)READ_ONCE(p); \
423a86a610cad1 Joel Fernandes (Google 2018-12-12 381) rcu_check_sparse(p, space); \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 382 ((typeof(*p) __force __kernel *)(_________p1)); \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 383 })
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 384 #define __rcu_dereference_check(p, c, space) \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 385 ({ \
ac59853c06993a Pranith Kumar 2014-11-13 386 /* Dependency order vs. p above. */ \
506458efaf153c Will Deacon 2017-10-24 387 typeof(*p) *________p1 = (typeof(*p) *__force)READ_ONCE(p); \
f78f5b90c4ffa5 Paul E. McKenney 2015-06-18 388 RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_check() usage"); \
423a86a610cad1 Joel Fernandes (Google 2018-12-12 389) rcu_check_sparse(p, space); \
ac59853c06993a Pranith Kumar 2014-11-13 390 ((typeof(*p) __force __kernel *)(________p1)); \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 391 })
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 392 #define __rcu_dereference_protected(p, c, space) \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 393 ({ \
f78f5b90c4ffa5 Paul E. McKenney 2015-06-18 394 RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
423a86a610cad1 Joel Fernandes (Google 2018-12-12 395) rcu_check_sparse(p, space); \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 396 ((typeof(*p) __force __kernel *)(p)); \
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 397 })
995f1405610bd8 Paul E. McKenney 2016-07-01 398 #define rcu_dereference_raw(p) \
995f1405610bd8 Paul E. McKenney 2016-07-01 399 ({ \
995f1405610bd8 Paul E. McKenney 2016-07-01 400 /* Dependency order vs. p above. */ \
506458efaf153c Will Deacon 2017-10-24 401 typeof(p) ________p1 = READ_ONCE(p); \
995f1405610bd8 Paul E. McKenney 2016-07-01 402 ((typeof(*p) __force __kernel *)(________p1)); \
995f1405610bd8 Paul E. McKenney 2016-07-01 403 })
ca5ecddfa8fcbd Paul E. McKenney 2010-04-28 404
:::::: The code at line 380 was first introduced by commit
:::::: 7d0ae8086b828311250c6afdf800b568ac9bd693 rcu: Convert ACCESS_ONCE() to READ_ONCE() and WRITE_ONCE()
:::::: TO: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
:::::: CC: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
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