Define isolate_movable_page as a static inline function when
CONFIG_MIGRATION is not enable. It should return -EBUSY here which means
failed to isolate movable pages.
This patch do not have any functional change but prepare for later patch.
Signed-off-by: Yisheng Xie <xieyishe...@huawei.com>
Acked-by: Minchan Kim <minc...@kernel.org>
Suggested-by: Michal Hocko <mho...@kernel.org>
Cc: Naoya Horiguchi <n-horigu...@ah.jp.nec.com>
Cc: Vlastimil Babka <vba...@suse.cz>
Cc: Andi Kleen <a...@linux.intel.com>
Cc: Hanjun Guo <guohan...@huawei.com>
Cc: Johannes Weiner <han...@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo....@lge.com>
Cc: Mel Gorman <mgor...@techsingularity.net>
Cc: Reza Arbab <ar...@linux.vnet.ibm.com>
Cc: Taku Izumi <izumi.t...@jp.fujitsu.com>
Cc: Vitaly Kuznetsov <vkuzn...@redhat.com>
Cc: Xishi Qiu <qiuxi...@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 43d5deb..fa76b51 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 int isolate_movable_page(struct page *page, isolate_mode_t mode)
+ { return -EBUSY; }
static inline int migrate_prep(void) { return -ENOSYS; }
static inline int migrate_prep_local(void) { return -ENOSYS; }
--
1.7.12.4
