linux-kernel - [PATCH v6 2/4] mm/migration: make isolate_movable

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Message-ID: <1486108770-630-3-git-send-email-xieyisheng1@huawei.com>
Date:   Fri, 3 Feb 2017 15:59:28 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <akpm@...ux-foundation.org>
CC:     <mhocko@...nel.org>, <minchan@...nel.org>, <ak@...ux.intel.com>,
        <guohanjun@...wei.com>, <hannes@...xchg.org>,
        <iamjoonsoo.kim@....com>, <mgorman@...hsingularity.net>,
        <n-horiguchi@...jp.nec.com>, <arbab@...ux.vnet.ibm.com>,
        <izumi.taku@...fujitsu.com>, <vkuznets@...hat.com>,
        <vbabka@...e.cz>, <qiuxishi@...wei.com>
Subject: [PATCH v6 2/4] mm/migration: make isolate_movable_page always defined

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>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Hanjun Guo <guohanjun@...wei.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Reza Arbab <arbab@...ux.vnet.ibm.com>
Cc: Taku Izumi <izumi.taku@...fujitsu.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Xishi Qiu <qiuxishi@...wei.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