mm: fold page_lru_base_type() into its sole caller

We've removed all other references to this function.

Link: https://lore.kernel.org/linux-mm/20201207220949.830352-9-yuzhao@google.com/
Signed-off-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>

include/linux/mm_inline.h

@@ -45,21 +45,6 @@ static __always_inline void update_lru_size(struct lruvec *lruvec,
 #endif
 }
 
-/**
- * page_lru_base_type - which LRU list type should a page be on?
- * @page: the page to test
- *
- * Used for LRU list index arithmetic.
- *
- * Returns the base LRU type - file or anon - @page should be on.
- */
-static inline enum lru_list page_lru_base_type(struct page *page)
-{
-	if (page_is_file_lru(page))
-		return LRU_INACTIVE_FILE;
-	return LRU_INACTIVE_ANON;
-}
-
 /**
  * __clear_page_lru_flags - clear page lru flags before releasing a page
  * @page: the page that was on lru and now has a zero reference
@@ -92,12 +77,12 @@ static __always_inline enum lru_list page_lru(struct page *page)
 	VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
 
 	if (PageUnevictable(page))
-		lru = LRU_UNEVICTABLE;
-	else {
-		lru = page_lru_base_type(page);
-		if (PageActive(page))
-			lru += LRU_ACTIVE;
-	}
+		return LRU_UNEVICTABLE;
+
+	lru = page_is_file_lru(page) ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON;
+	if (PageActive(page))
+		lru += LRU_ACTIVE;
+
 	return lru;
 }