[bigeasy-staging:futex_local_v12 14/21] include/linux/rcupdate.h:555:36: error: dereferencing pointer to incomplete type 'struct futex_private_hash'

[bigeasy-staging:futex_local_v12 14/21] include/linux/rcupdate.h:555:36: error: dereferencing pointer to incomplete type 'struct futex_private_hash'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/bigeasy/staging.git futex_local_v12
head:   81ec9cc1b38f44c4364df62c7b8985c90a983904
commit: 0753221e1dc684b7178a80ed444f9d1b9e79515e [14/21] futex: Allow to resize the private local hash
config: sparc64-randconfig-r051-20250428 (https://download.01.org/0day-ci/archive/20250507/202505071703.082qq5RF-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250507/202505071703.082qq5RF-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/202505071703.082qq5RF-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from ./arch/sparc/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:390,
                    from include/linux/build_bug.h:5,
                    from include/linux/bits.h:22,
                    from include/linux/gfp_types.h:5,
                    from include/linux/gfp.h:5,
                    from include/linux/slab.h:16,
                    from kernel/fork.c:16:
   include/linux/futex.h: In function 'futex_mm_init':
>> include/linux/rcupdate.h:555:36: error: dereferencing pointer to incomplete type 'struct futex_private_hash'
    #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
                                       ^~~~
   include/asm-generic/rwonce.h:55:33: note: in definition of macro '__WRITE_ONCE'
     *(volatile typeof(x) *)&(x) = (val);    \
                                    ^~~
   arch/sparc/include/asm/barrier_64.h:45:2: note: in expansion of macro 'WRITE_ONCE'
     WRITE_ONCE(*p, v);      \
     ^~~~~~~~~~
   include/asm-generic/barrier.h:172:55: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) do { kcsan_release(); __smp_store_release(p, v); } while (0)
                                                          ^~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:596:3: note: in expansion of macro 'smp_store_release'
      smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
      ^~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:596:25: note: in expansion of macro 'RCU_INITIALIZER'
      smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
                            ^~~~~~~~~~~~~~~
   include/linux/futex.h:88:2: note: in expansion of macro 'rcu_assign_pointer'
     rcu_assign_pointer(mm->futex_phash, NULL);
     ^~~~~~~~~~~~~~~~~~
   kernel/fork.c: In function '__do_sys_clone3':
   kernel/fork.c:3159:2: warning: #warning clone3() entry point is missing, please fix [-Wcpp]
    #warning clone3() entry point is missing, please fix
     ^~~~~~~
--
   In file included from ./arch/sparc/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:390,
                    from arch/sparc/include/asm/bug.h:6,
                    from include/linux/bug.h:5,
                    from include/linux/mmdebug.h:5,
                    from include/linux/mm.h:6,
                    from kernel/exit.c:8:
   include/linux/futex.h: In function 'futex_mm_init':
>> include/linux/rcupdate.h:555:36: error: dereferencing pointer to incomplete type 'struct futex_private_hash'
    #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
                                       ^~~~
   include/asm-generic/rwonce.h:55:33: note: in definition of macro '__WRITE_ONCE'
     *(volatile typeof(x) *)&(x) = (val);    \
                                    ^~~
   arch/sparc/include/asm/barrier_64.h:45:2: note: in expansion of macro 'WRITE_ONCE'
     WRITE_ONCE(*p, v);      \
     ^~~~~~~~~~
   include/asm-generic/barrier.h:172:55: note: in expansion of macro '__smp_store_release'
    #define smp_store_release(p, v) do { kcsan_release(); __smp_store_release(p, v); } while (0)
                                                          ^~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:596:3: note: in expansion of macro 'smp_store_release'
      smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
      ^~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:596:25: note: in expansion of macro 'RCU_INITIALIZER'
      smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
                            ^~~~~~~~~~~~~~~
   include/linux/futex.h:88:2: note: in expansion of macro 'rcu_assign_pointer'
     rcu_assign_pointer(mm->futex_phash, NULL);
     ^~~~~~~~~~~~~~~~~~


vim +555 include/linux/rcupdate.h

ca5ecddfa8fcbd Paul E. McKenney 2010-04-28  550  
462225ae47d717 Paul E. McKenney 2013-11-11  551  /**
462225ae47d717 Paul E. McKenney 2013-11-11  552   * RCU_INITIALIZER() - statically initialize an RCU-protected global variable
462225ae47d717 Paul E. McKenney 2013-11-11  553   * @v: The value to statically initialize with.
462225ae47d717 Paul E. McKenney 2013-11-11  554   */
462225ae47d717 Paul E. McKenney 2013-11-11 @555  #define RCU_INITIALIZER(v) (typeof(*(v)) __force __rcu *)(v)
462225ae47d717 Paul E. McKenney 2013-11-11  556  

:::::: The code at line 555 was first introduced by commit
:::::: 462225ae47d7175f886281d8a91708550cd5178c rcu: Add an RCU_INITIALIZER for global RCU-protected pointers

:::::: TO: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
:::::: CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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https://github.com/intel/lkp-tests/wiki