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From:   Christoph Hellwig <hch@infradead.org>
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        jane.chu@oracle.com, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v12 2/7] mm: factor helpers for memory_failure_dev_pagemap
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> +	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".