tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git 
mmap_sem.2017.08.09a
head:   39782fbd9252a3ace9b49a55f4dd2a41a6ced31f
commit: 1b801585f6b03276db9722dc725a50ca11439467 [6/16] mm: RCU free VMAs
config: i386-tinyconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 1b801585f6b03276db9722dc725a50ca11439467
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the rcu/mmap_sem.2017.08.09a HEAD 
39782fbd9252a3ace9b49a55f4dd2a41a6ced31f builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   In file included from mm/filemap.c:39:0:
   mm/internal.h: In function 'vma_has_changed':
>> mm/internal.h:59:26: error: 'struct vm_fault' has no member named 'sequence'
     return ret || seq != vmf->sequence;
                             ^~
--
   In file included from lib/vsprintf.c:40:0:
   lib/../mm/internal.h: In function 'vma_has_changed':
>> lib/../mm/internal.h:59:26: error: 'struct vm_fault' has no member named 
>> 'sequence'
     return ret || seq != vmf->sequence;
                             ^~

vim +59 mm/internal.h

    44  
    45  extern struct vm_area_struct *find_vma_srcu(struct mm_struct *mm,
    46                                              unsigned long addr);
    47  
    48  static inline bool vma_has_changed(struct vm_fault *vmf)
    49  {
    50          int ret = RB_EMPTY_NODE(&vmf->vma->vm_rb);
    51          unsigned seq = ACCESS_ONCE(vmf->vma->vm_sequence.sequence);
    52  
    53          /*
    54           * Matches both the wmb in write_seqlock_{begin,end}() and
    55           * the wmb in vma_rb_erase().
    56           */
    57          smp_rmb();
    58  
  > 59          return ret || seq != vmf->sequence;
    60  }
    61  

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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