filemap: remove find_get_pages()

It's unused now. Remove it and clean up the relevant comment.

Link: https://lkml.kernel.org/r/20220208134149.47299-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/pagemap.h

@@ -594,13 +594,6 @@ static inline struct page *find_subpage(struct page *head, pgoff_t index)
 unsigned find_get_pages_range(struct address_space *mapping, pgoff_t *start,
 			pgoff_t end, unsigned int nr_pages,
 			struct page **pages);
-static inline unsigned find_get_pages(struct address_space *mapping,
-			pgoff_t *start, unsigned int nr_pages,
-			struct page **pages)
-{
-	return find_get_pages_range(mapping, start, (pgoff_t)-1, nr_pages,
-				    pages);
-}
 unsigned find_get_pages_contig(struct address_space *mapping, pgoff_t start,
 			       unsigned int nr_pages, struct page **pages);
 unsigned find_get_pages_range_tag(struct address_space *mapping, pgoff_t *index,

mm/filemap.c

@@ -2229,8 +2229,9 @@ out:
  * @nr_pages:	The maximum number of pages
  * @pages:	Where the resulting pages are placed
  *
- * find_get_pages_contig() works exactly like find_get_pages(), except
- * that the returned number of pages are guaranteed to be contiguous.
+ * find_get_pages_contig() works exactly like find_get_pages_range(),
+ * except that the returned number of pages are guaranteed to be
+ * contiguous.
  *
  * Return: the number of pages which were found.
  */
@@ -2290,9 +2291,9 @@ EXPORT_SYMBOL(find_get_pages_contig);
  * @nr_pages:	the maximum number of pages
  * @pages:	where the resulting pages are placed
  *
- * Like find_get_pages(), except we only return head pages which are tagged
- * with @tag.  @index is updated to the index immediately after the last
- * page we return, ready for the next iteration.
+ * Like find_get_pages_range(), except we only return head pages which are
+ * tagged with @tag.  @index is updated to the index immediately after the
+ * last page we return, ready for the next iteration.
  *
  * Return: the number of pages which were found.
  */