[PATCH v2 12/22] mm: Export writeback_iter()

[David Howells <dhowells@xxxxxxxxxx>]

Export writeback_iter() so that it can be used by netfslib as a module.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
cc: Christoph Hellwig <hch@xxxxxx>
cc: linux-mm@xxxxxxxxx
---

Notes:
    Changes
    =======
    ver #2)
     - Mark the symbol _GPL.

 mm/page-writeback.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 3e19b87049db..06fc89d981e8 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2546,6 +2546,7 @@ struct folio *writeback_iter(struct address_space *mapping,
 	folio_batch_release(&wbc->fbatch);
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(writeback_iter);
 
 /**
  * write_cache_pages - walk the list of dirty pages of the given address space and write all of them.