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From: Christoph Hellwig <hch@lst.de>
To: David Howells <dhowells@redhat.com>
Subject: Re: [PATCH v2 07/22] mm: Provide a means of invalidation without
 using launder_folio
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> +	unmap_mapping_pages(mapping, first, nr, false);

> +}
> +EXPORT_SYMBOL(filemap_invalidate_inode);

unmap_mapping_pages is an EXPORT_SYMBOL_GPL, pleas keep that in
this in thin wrapper.