rmap: remove DEFINE_PAGE_VMA_WALK()

This are no users since commit 40d707f3 ("mm/ksm: use folio in
write_protect_page"), so remove DEFINE_PAGE_VMA_WALK().

Link: https://lkml.kernel.org/r/20240524053618.208895-1-wangkefeng.wang@huawei.comSigned-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/rmap.h

@@ -684,16 +684,6 @@ struct page_vma_mapped_walk {
 	unsigned int flags;
 };
 
-#define DEFINE_PAGE_VMA_WALK(name, _page, _vma, _address, _flags)	\
-	struct page_vma_mapped_walk name = {				\
-		.pfn = page_to_pfn(_page),				\
-		.nr_pages = compound_nr(_page),				\
-		.pgoff = page_to_pgoff(_page),				\
-		.vma = _vma,						\
-		.address = _address,					\
-		.flags = _flags,					\
-	}
-
 #define DEFINE_FOLIO_VMA_WALK(name, _folio, _vma, _address, _flags)	\
 	struct page_vma_mapped_walk name = {				\
 		.pfn = folio_pfn(_folio),				\