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Groups > linux.kernel > #1570747

[PATCH v5 2/4] mm/migration: make isolate_movable_page always defined

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From: Yisheng Xie <xieyisheng1@huawei.com>

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 <xieyisheng1@huawei.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Suggested-by: Michal Hocko <mhocko@kernel.org>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
CC: Vlastimil Babka <vbabka@suse.cz>
---
 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; }
-- 
1.9.1


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[PATCH v5 0/4] HWPOISON: soft offlining for non-lru movable page ysxie@foxmail.com - 2017-01-31 14:30 +0100
  [PATCH v5 2/4] mm/migration: make isolate_movable_page always defined ysxie@foxmail.com - 2017-01-31 14:30 +0100
  [PATCH v5 3/4] HWPOISON: soft offlining for non-lru movable page ysxie@foxmail.com - 2017-01-31 14:40 +0100

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