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thp: run vma_adjust_trans_huge() outside i_mmap_rwsem
vma_addjust_trans_huge() splits pmd if it's crossing VMA boundary. During split we munlock the huge page which requires rmap walk. rmap wants to take the lock on its own. Let's move vma_adjust_trans_huge() outside i_mmap_rwsem to fix this. Link: http://lkml.kernel.org/r/1466021202-61880-19-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -675,6 +675,8 @@ again: remove_next = 1 + (end > next->vm_end);
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}
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}
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}
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}
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vma_adjust_trans_huge(vma, start, end, adjust_next);
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if (file) {
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if (file) {
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mapping = file->f_mapping;
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mapping = file->f_mapping;
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root = &mapping->i_mmap;
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root = &mapping->i_mmap;
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@ -695,8 +697,6 @@ again: remove_next = 1 + (end > next->vm_end);
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}
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}
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}
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}
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vma_adjust_trans_huge(vma, start, end, adjust_next);
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anon_vma = vma->anon_vma;
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anon_vma = vma->anon_vma;
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if (!anon_vma && adjust_next)
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if (!anon_vma && adjust_next)
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anon_vma = next->anon_vma;
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anon_vma = next->anon_vma;
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