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Date:   Mon, 3 Jan 2022 01:44:24 +0000
From:   Matthew Wilcox <willy@infradead.org>
To:     linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 00/48] Folios for 5.17
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On Sun, Jan 02, 2022 at 04:19:41PM +0000, Matthew Wilcox wrote:
> +++ b/include/linux/uio.h
> @@ -150,7 +150,7 @@ size_t _copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i);
>  static inline size_t copy_folio_to_iter(struct folio *folio, size_t offset,
>  		size_t bytes, struct iov_iter *i)
>  {
> -	return copy_page_to_iter((struct page *)folio, offset, bytes, i);
> +	return copy_page_to_iter(&folio->page, offset, bytes, i);
>  }

Mmmpf.  I should have tested this more thoroughly.  Some files currently
include uio.h without including mm_types.h.  So this on top fixes
the build:

+++ b/include/linux/uio.h
@@ -7,10 +7,10 @@

 #include <linux/kernel.h>
 #include <linux/thread_info.h>
+#include <linux/mm_types.h>
 #include <uapi/linux/uio.h>

 struct page;
-struct folio;
 struct pipe_inode_info;

 struct kvec {