On Mon 06-01-14 20:45:54, Bob Liu wrote:
[...]
> 544 if (PageAnon(page)) {
> 545 struct anon_vma *page__anon_vma = page_anon_vma(page);
> 546 /*
> 547 * Note: swapoff's unuse_vma() is more efficient with this
> 548 * check, and needs it to match anon_vma when KSM is active.
> 549 */
> 550 if (!vma->anon_vma || !page__anon_vma ||
> 551 vma->anon_vma->root != page__anon_vma->root)
> 552 return -EFAULT;
> 553 } else if (page->mapping && !(vma->vm_flags & VM_NONLINEAR)) {
> 554 if (!vma->vm_file ||
> 555 vma->vm_file->f_mapping != page->mapping)
> 556 return -EFAULT;
> 557 } else
> 558 return -EFAULT;
>
> That's the "other conditions" and the reason why we can't use
> BUG_ON(!vma) in new_vma_page().
Sorry, I wasn't clear with my question. I was interested in which of
these triggered and why only for hugetlb pages?
--
Michal Hocko
SUSE Labs
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