[rcu:rcu/next 51/58] mm/mmu_notifier.c:259:14: error: 'struct srcu_struct' has no member named 'per_cpu_ref'

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   b9d38ad8ef2a0ae0ba6e03ac6bf8085382a9c98c
commit: 89489e6fa42785b3fc4c78f46c78cb73b9a164d3 [51/58] srcu: Create a tiny SRCU
config: x86_64-randconfig-ne0-04120549 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 89489e6fa42785b3fc4c78f46c78cb73b9a164d3
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: the rcu/rcu/next HEAD b9d38ad8ef2a0ae0ba6e03ac6bf8085382a9c98c builds fine.
      It only hurts bisectibility.

All error/warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from include/uapi/linux/posix_types.h:4,
                    from include/uapi/linux/types.h:13,
                    from include/linux/types.h:5,
                    from include/linux/list.h:4,
                    from include/linux/rculist.h:9,
                    from mm/mmu_notifier.c:12:
   mm/mmu_notifier.c: In function 'do_mmu_notifier_register':
>> mm/mmu_notifier.c:259:14: error: 'struct srcu_struct' has no member named 'per_cpu_ref'
     BUG_ON(!srcu.per_cpu_ref);
                 ^
   include/linux/compiler.h:179:42: note: in definition of macro 'unlikely'
    # define unlikely(x) __builtin_expect(!!(x), 0)
                                             ^
>> mm/mmu_notifier.c:259:2: note: in expansion of macro 'BUG_ON'
     BUG_ON(!srcu.per_cpu_ref);
     ^~~~~~

vim +259 mm/mmu_notifier.c

cddb8a5c Andrea Arcangeli 2008-07-28  253  	BUG_ON(atomic_read(&mm->mm_users) <= 0);
cddb8a5c Andrea Arcangeli 2008-07-28  254  
21a92735 Sagi Grimberg    2012-10-08  255  	/*
21a92735 Sagi Grimberg    2012-10-08  256  	 * Verify that mmu_notifier_init() already run and the global srcu is
21a92735 Sagi Grimberg    2012-10-08  257  	 * initialized.
21a92735 Sagi Grimberg    2012-10-08  258  	 */
21a92735 Sagi Grimberg    2012-10-08 @259  	BUG_ON(!srcu.per_cpu_ref);
21a92735 Sagi Grimberg    2012-10-08  260  
35cfa2b0 Gavin Shan       2012-10-25  261  	ret = -ENOMEM;
35cfa2b0 Gavin Shan       2012-10-25  262  	mmu_notifier_mm = kmalloc(sizeof(struct mmu_notifier_mm), GFP_KERNEL);

:::::: The code at line 259 was first introduced by commit
:::::: 21a92735f660eaecf69a6f2e777f18463760ec32 mm: mmu_notifier: have mmu_notifiers use a global SRCU so they may safely schedule

:::::: TO: Sagi Grimberg <sagig@mellanox.co.il>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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