Re: [PATCH v8 2/5] tracing: Use the stackmap from the ftrace stack recording path

[kernel test robot <lkp@intel.com>]

Hi Li,

kernel test robot noticed the following build errors:

[auto build test ERROR on 4539944e515183668109bdf4d0c3d7d228383d88]

url:    https://github.com/intel-lab-lkp/linux/commits/Li-Pengfei/tracing-Add-lock-free-stackmap-for-stack-trace-deduplication/20261107-135135
base:   4539944e515183668109bdf4d0c3d7d228383d88
patch link:    https://lore.kernel.org/r/20261107055139.3138633-3-lipengfei28%40xiaomi.com
patch subject: [PATCH v8 2/5] tracing: Use the stackmap from the ftrace stack recording path
config: powerpc-randconfig-1001-20261108 (https://download.01.org/0day-ci/archive/20261108/202611080654.sqFxIlwl-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261108/202611080654.sqFxIlwl-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202611080654.sqFxIlwl-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/rbtree.h:24,
                    from include/linux/mm_types.h:11,
                    from include/linux/mmzone.h:22,
                    from include/linux/gfp.h:7,
                    from include/linux/mm.h:8,
                    from include/linux/ring_buffer.h:5,
                    from kernel/trace/trace.c:15:
   kernel/trace/trace.c: In function 'record_stackmap':
>> include/linux/rcupdate.h:502:9: error: dereferencing pointer to incomplete type 'struct ftrace_stackmap'
     typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
            ^
   include/linux/rcupdate.h:684:2: note: in expansion of macro '__rcu_dereference_check'
     __rcu_dereference_check((p), __UNIQUE_ID(rcu), \
     ^~~~~~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:758:34: note: in expansion of macro 'rcu_dereference_sched_check'
    #define rcu_dereference_sched(p) rcu_dereference_sched_check(p, 0)
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   kernel/trace/trace.c:2154:9: note: in expansion of macro 'rcu_dereference_sched'
     smap = rcu_dereference_sched(tr->stackmap);
            ^~~~~~~~~~~~~~~~~~~~~


vim +502 include/linux/rcupdate.h

76c8eaafe4f061f Paul E. McKenney        2021-04-21  492  
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  493  #define __rcu_access_pointer(p, local, space) \
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  494  ({ \
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  495  	typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
423a86a610cad12 Joel Fernandes (Google  2018-12-12  496) 	rcu_check_sparse(p, space); \
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  497  	((typeof(*p) __force __kernel *)(local)); \
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  498  })
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  499  #define __rcu_dereference_check(p, local, c, space) \
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  500  ({ \
ac59853c06993a4 Pranith Kumar           2014-11-13  501  	/* Dependency order vs. p above. */ \
24ba53017e188e0 Chun-Hung Tseng         2021-09-15 @502  	typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
f78f5b90c4ffa55 Paul E. McKenney        2015-06-18  503  	RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_check() usage"); \
423a86a610cad12 Joel Fernandes (Google  2018-12-12  504) 	rcu_check_sparse(p, space); \
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  505  	((typeof(*p) __force __kernel *)(local)); \
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  506  })
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  507  #define __rcu_dereference_protected(p, local, c, space) \
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  508  ({ \
f78f5b90c4ffa55 Paul E. McKenney        2015-06-18  509  	RCU_LOCKDEP_WARN(!(c), "suspicious rcu_dereference_protected() usage"); \
423a86a610cad12 Joel Fernandes (Google  2018-12-12  510) 	rcu_check_sparse(p, space); \
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  511  	((typeof(*p) __force __kernel *)(p)); \
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  512  })
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  513  #define __rcu_dereference_raw(p, local) \
995f1405610bd84 Paul E. McKenney        2016-07-01  514  ({ \
995f1405610bd84 Paul E. McKenney        2016-07-01  515  	/* Dependency order vs. p above. */ \
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  516  	typeof(p) local = READ_ONCE(p); \
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  517  	((typeof(*p) __force __kernel *)(local)); \
995f1405610bd84 Paul E. McKenney        2016-07-01  518  })
24ba53017e188e0 Chun-Hung Tseng         2021-09-15  519  #define rcu_dereference_raw(p) __rcu_dereference_raw(p, __UNIQUE_ID(rcu))
ca5ecddfa8fcbd9 Paul E. McKenney        2010-04-28  520  

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