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Subject[rcu:mmap_sem.2017.08.09a 6/16] mm/internal.h:59:26: error: 'struct vm_fault' has no member named 'sequence'
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

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