[PATCH] mm/migration: make isolate_movable_page always defined

[Yisheng Xie <xieyisheng1@huawei.com>]

Define isolate_movable_page as a static inline function when
CONFIG_MIGRATION is not enable. It should return false
here which means failed to isolate movable pages.

This patch do not have any functional change but to resolve compile
error caused by former commit "HWPOISON: soft offlining for non-lru
movable page" with CONFIG_MIGRATION disabled.

Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
---
 include/linux/migrate.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index ae8d475..631a8c8 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -56,6 +56,8 @@ static inline int migrate_pages(struct list_head *l, new_page_t new,
 		free_page_t free, unsigned long private, enum migrate_mode mode,
 		int reason)
 	{ return -ENOSYS; }
+static inline bool isolate_movable_page(struct page *page, isolate_mode_t mode)
+	{ return false; }
 
 static inline int migrate_prep(void) { return -ENOSYS; }
 static inline int migrate_prep_local(void) { return -ENOSYS; }
-- 
1.7.12.4

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