mm/balloon_compaction: provide single balloon_page_insert() and balloon_mapping_gfp_mask()

Let's just special-case based on IS_ENABLED(CONFIG_BALLOON_COMPACTION)
like we did for balloon_page_finalize().

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: David Hildenbrand <[e-mail]>
Reviewed-by: Lorenzo Stoakes <[e-mail]>
Cc: Alistair Popple <[e-mail]>
Cc: Al Viro <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Brendan Jackman <[e-mail]>
Cc: Byungchul Park <[e-mail]>
Cc: Chengming Zhou <[e-mail]>
Cc: Christian Brauner <[e-mail]>
Cc: Christophe Leroy <[e-mail]>
Cc: Eugenio Pé rez <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Gregory Price <[e-mail]>
Cc: Harry Yoo <[e-mail]>
Cc: "Huang, Ying" <[e-mail]>
Cc: Jan Kara <[e-mail]>
Cc: Jason Gunthorpe <[e-mail]>
Cc: Jason Wang <[e-mail]>
Cc: Jerrin Shaji George <[e-mail]>
Cc: Johannes Weiner <[e-mail]>
Cc: John Hubbard <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: Joshua Hahn <[e-mail]>
Cc: Liam Howlett <[e-mail]>
Cc: Madhavan Srinivasan <[e-mail]>
Cc: Mathew Brost <[e-mail]>
Cc: Matthew Wilcox (Oracle) <[e-mail]>
Cc: Miaohe Lin <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: "Michael S. Tsirkin" <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Mike Rapoport <[e-mail]>
Cc: Minchan Kim <[e-mail]>
Cc: Naoya Horiguchi <[e-mail]>
Cc: Nicholas Piggin <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: Peter Xu <[e-mail]>
Cc: Qi Zheng <[e-mail]>
Cc: Rakie Kim <[e-mail]>
Cc: Rik van Riel <[e-mail]>
Cc: Sergey Senozhatsky <[e-mail]>
Cc: Shakeel Butt <[e-mail]>
Cc: Suren Baghdasaryan <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Cc: Xuan Zhuo <[e-mail]>
Cc: xu xin <[e-mail]>
Cc: Zi Yan <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

include/linux/balloon_compaction.h

···
 
 #ifdef CONFIG_BALLOON_COMPACTION
 extern const struct movable_operations balloon_mops;
+/*
+ * balloon_page_device - get the b_dev_info descriptor for the balloon device
+ *			 that enqueues the given page.
+ */
+static inline struct balloon_dev_info *balloon_page_device(struct page *page)
+{
+	return (struct balloon_dev_info *)page_private(page);
+}
+#endif /* CONFIG_BALLOON_COMPACTION */
 
 /*
  * balloon_page_insert - insert a page into the balloon's page list and make
···
 				       struct page *page)
 {
 	__SetPageOffline(page);
-	SetPageMovableOps(page);
-	set_page_private(page, (unsigned long)balloon);
-	list_add(&page->lru, &balloon->pages);
-}
-
-/*
- * balloon_page_device - get the b_dev_info descriptor for the balloon device
- *			 that enqueues the given page.
- */
-static inline struct balloon_dev_info *balloon_page_device(struct page *page)
-{
-	return (struct balloon_dev_info *)page_private(page);
-}
-
-static inline gfp_t balloon_mapping_gfp_mask(void)
-{
-	return GFP_HIGHUSER_MOVABLE;
-}
-
-#else /* !CONFIG_BALLOON_COMPACTION */
-
-static inline void balloon_page_insert(struct balloon_dev_info *balloon,
-				       struct page *page)
-{
-	__SetPageOffline(page);
+	if (IS_ENABLED(CONFIG_BALLOON_COMPACTION)) {
+		SetPageMovableOps(page);
+		set_page_private(page, (unsigned long)balloon);
+	}
 	list_add(&page->lru, &balloon->pages);
 }
 
 static inline gfp_t balloon_mapping_gfp_mask(void)
 {
+	if (IS_ENABLED(CONFIG_BALLOON_COMPACTION))
+		return GFP_HIGHUSER_MOVABLE;
 	return GFP_HIGHUSER;
 }
-
-#endif /* CONFIG_BALLOON_COMPACTION */
 
 /*
  * balloon_page_finalize - prepare a balloon page that was removed from the