[PATCH 4/9] migrate: clean up migrate_huge_page()

[Naoya Horiguchi]

Due to the previous patch, soft_offline_huge_page() switches to use
migrate_pages(), and migrate_huge_page() is not used any more.
So let's remove it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
---
 include/linux/migrate.h |  6 ------
 mm/migrate.c            | 28 ----------------------------
 2 files changed, 34 deletions(-)

diff --git v3.8.orig/include/linux/migrate.h v3.8/include/linux/migrate.h
index d626c27..dc085e1 100644
--- v3.8.orig/include/linux/migrate.h
+++ v3.8/include/linux/migrate.h
@@ -45,9 +45,6 @@ extern int migrate_pages(struct list_head *l, new_page_t x,
 extern int migrate_movable_pages(struct list_head *from,
 		new_page_t get_new_page, unsigned long private, bool offlining,
 		enum migrate_mode mode, int reason);
-extern int migrate_huge_page(struct page *, new_page_t x,
-			unsigned long private, bool offlining,
-			enum migrate_mode mode);
 
 extern int fail_migrate_page(struct address_space *,
 			struct page *, struct page *);
@@ -70,9 +67,6 @@ static inline int migrate_pages(struct list_head *l, new_page_t x,
 static inline int migrate_movable_pages(struct list_head *from,
 		new_page_t get_new_page, unsigned long private, bool offlining,
 		enum migrate_mode mode, int reason) { return -ENOSYS; }
-static inline int migrate_huge_page(struct page *page, new_page_t x,
-		unsigned long private, bool offlining,
-		enum migrate_mode mode) { return -ENOSYS; }
 
 static inline int migrate_prep(void) { return -ENOSYS; }
 static inline int migrate_prep_local(void) { return -ENOSYS; }
diff --git v3.8.orig/mm/migrate.c v3.8/mm/migrate.c
index 8c13cc5..7b2ca1a 100644
--- v3.8.orig/mm/migrate.c
+++ v3.8/mm/migrate.c
@@ -1106,34 +1106,6 @@ int migrate_movable_pages(struct list_head *from, new_page_t get_new_page,
 	return err;
 }
 
-int migrate_huge_page(struct page *hpage, new_page_t get_new_page,
-		      unsigned long private, bool offlining,
-		      enum migrate_mode mode)
-{
-	int pass, rc;
-
-	for (pass = 0; pass < 10; pass++) {
-		rc = unmap_and_move_huge_page(get_new_page,
-					      private, hpage, pass > 2, offlining,
-					      mode);
-		switch (rc) {
-		case -ENOMEM:
-			goto out;
-		case -EAGAIN:
-			/* try again */
-			cond_resched();
-			break;
-		case MIGRATEPAGE_SUCCESS:
-			goto out;
-		default:
-			rc = -EIO;
-			goto out;
-		}
-	}
-out:
-	return rc;
-}
-
 #ifdef CONFIG_NUMA
 /*
  * Move a list of individual pages
-- 
1.7.11.7

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