linux-kernel - [PATCH v5 2/4] mm/migration: make isolate_movable

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Message-Id: <1485867981-16037-3-git-send-email-ysxie@foxmail.com>
Date:   Tue, 31 Jan 2017 21:06:19 +0800
From:   ysxie@...mail.com
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     n-horiguchi@...jp.nec.com, mhocko@...e.com,
        akpm@...ux-foundation.org, minchan@...nel.org, vbabka@...e.cz,
        mgorman@...hsingularity.net, hannes@...xchg.org,
        iamjoonsoo.kim@....com, izumi.taku@...fujitsu.com,
        arbab@...ux.vnet.ibm.com, vkuznets@...hat.com, ak@...ux.intel.com,
        guohanjun@...wei.com, qiuxishi@...wei.com
Subject: [PATCH v5 2/4] mm/migration: make isolate_movable_page always defined

From: Yisheng Xie <xieyisheng1@...wei.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@...wei.com>
Acked-by: Minchan Kim <minchan@...nel.org>
Suggested-by: Michal Hocko <mhocko@...nel.org>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC: Vlastimil Babka <vbabka@...e.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
.