linux-kernel - [mingo-tip:master 1440/2335] include/linux/rcupdate.h:381:9: error: dereferencing pointer to incomplete type 'struct task

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Date:   Thu, 17 Mar 2022 12:17:31 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mingo-tip:master 1440/2335] include/linux/rcupdate.h:381:9: error:
 dereferencing pointer to incomplete type 'struct task_struct'

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master
head:   85293bf3fca6d85608cff1447ce3097583f15fab
commit: 60aa8b48a7618b32090b091987090a4795b278cb [1440/2335] headers/deps: rcu/wait: Remove <linux/sched/task_flags.h> from <linux/rcuwait.h>
config: i386-randconfig-a001-20220314 (https://download.01.org/0day-ci/archive/20220317/202203171240.Swhj47Ft-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=60aa8b48a7618b32090b091987090a4795b278cb
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip master
        git checkout 60aa8b48a7618b32090b091987090a4795b278cb
        # 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@...el.com>

All errors (new ones prefixed by >>):

   In file included from include/linux/rcuwait.h:5,
                    from include/linux/percpu_rwsem.h:7,
                    from include/linux/percpu_rwsem_api.h:2,
                    from fs/ext4/migrate.c:10:
   include/linux/rcuwait.h: In function 'rcuwait_active':
>> include/linux/rcupdate.h:381:9: error: dereferencing pointer to incomplete type 'struct task_struct'
     381 |  typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
         |         ^
   include/linux/rcupdate.h:492:31: note: in expansion of macro '__rcu_access_pointer'
     492 | #define rcu_access_pointer(p) __rcu_access_pointer((p), __UNIQUE_ID(rcu), __rcu)
         |                               ^~~~~~~~~~~~~~~~~~~~
   include/linux/rcuwait.h:33:11: note: in expansion of macro 'rcu_access_pointer'
      33 |  return !!rcu_access_pointer(w->task);
         |           ^~~~~~~~~~~~~~~~~~


vim +381 include/linux/rcupdate.h

76c8eaafe4f061 Paul E. McKenney        2021-04-21  378  
24ba53017e188e Chun-Hung Tseng         2021-09-15  379  #define __rcu_access_pointer(p, local, space) \
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  380  ({ \
24ba53017e188e Chun-Hung Tseng         2021-09-15 @381  	typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
423a86a610cad1 Joel Fernandes (Google  2018-12-12  382) 	rcu_check_sparse(p, space); \
24ba53017e188e Chun-Hung Tseng         2021-09-15  383  	((typeof(*p) __force __kernel *)(local)); \
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  384  })
24ba53017e188e Chun-Hung Tseng         2021-09-15  385  #define __rcu_dereference_check(p, local, c, space) \
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  386  ({ \
ac59853c06993a Pranith Kumar           2014-11-13  387  	/* Dependency order vs. p above. */ \
24ba53017e188e Chun-Hung Tseng         2021-09-15  388  	typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
f78f5b90c4ffa5 Paul E. McKenney        2015-06-18  389  	RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_check() usage"); \
423a86a610cad1 Joel Fernandes (Google  2018-12-12  390) 	rcu_check_sparse(p, space); \
24ba53017e188e Chun-Hung Tseng         2021-09-15  391  	((typeof(*p) __force __kernel *)(local)); \
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  392  })
24ba53017e188e Chun-Hung Tseng         2021-09-15  393  #define __rcu_dereference_protected(p, local, c, space) \
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  394  ({ \
f78f5b90c4ffa5 Paul E. McKenney        2015-06-18  395  	RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
423a86a610cad1 Joel Fernandes (Google  2018-12-12  396) 	rcu_check_sparse(p, space); \
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  397  	((typeof(*p) __force __kernel *)(p)); \
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  398  })
24ba53017e188e Chun-Hung Tseng         2021-09-15  399  #define __rcu_dereference_raw(p, local) \
995f1405610bd8 Paul E. McKenney        2016-07-01  400  ({ \
995f1405610bd8 Paul E. McKenney        2016-07-01  401  	/* Dependency order vs. p above. */ \
24ba53017e188e Chun-Hung Tseng         2021-09-15  402  	typeof(p) local = READ_ONCE(p); \
24ba53017e188e Chun-Hung Tseng         2021-09-15  403  	((typeof(*p) __force __kernel *)(local)); \
995f1405610bd8 Paul E. McKenney        2016-07-01  404  })
24ba53017e188e Chun-Hung Tseng         2021-09-15  405  #define rcu_dereference_raw(p) __rcu_dereference_raw(p, __UNIQUE_ID(rcu))
ca5ecddfa8fcbd Paul E. McKenney        2010-04-28  406  

:::::: The code at line 381 was first introduced by commit
:::::: 24ba53017e188e031f9cb8b290286fad52d2af00 rcu: Replace ________p1 and _________p1 with __UNIQUE_ID(rcu)

:::::: TO: Chun-Hung Tseng <henrybear327@...il.com>
:::::: CC: Paul E. McKenney <paulmck@...nel.org>

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