Re: [PATCH v12 2/7] mm: factor helpers for memory_failure_dev_pagemap

[Christoph Hellwig]

> +     unmap_and_kill(&to_kill, pfn, page->mapping, page->index, flags);
> +unlock:
> +     dax_unlock_page(page, cookie);
> +     return 0;

As the buildbot points out this should probably be a "return rc".