On Thu, Jan 26, 2023 at 02:16:19PM +0000, David Howells wrote:

+typedef unsigned int iov_iter_extraction_t;

+/* Flags for iov_iter_get/extract_pages*() */
+/* Allow P2PDMA on the extracted pages */
+#define ITER_ALLOW_P2PDMA	((__force iov_iter_extraction_t)0x01)

That __force makes sense only if you make it a bitwise type -
otherwise it's meaningless.  IOW, either turn the typedef into

typedef unsigned int __bitwise iov_iter_extraction_t;

or lose __force in the cast...