linux-kernel - [PATCH v6 1/4] mm/migration: make isolate_movable

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Date:   Fri, 3 Feb 2017 15:59:27 +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 1/4] mm/migration: make isolate_movable_page() return int type

Change the return type of isolate_movable_page() from bool to int.  It
will return 0 when isolate movable page successfully, and return -EBUSY
when it isolates failed.

There is no functional change within this patch but prepare for later
patch.

Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
Suggested-by: Michal Hocko <mhocko@...nel.org>
Suggested-by: Minchan Kim <minchan@...nel.org>
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: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Reza Arbab <arbab@...ux.vnet.ibm.com>
Cc: Taku Izumi <izumi.taku@...fujitsu.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Xishi Qiu <qiuxishi@...wei.com>
---
 include/linux/migrate.h | 2 +-
 mm/compaction.c         | 2 +-
 mm/migrate.c            | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index ae8d475..43d5deb 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -37,7 +37,7 @@ extern int migrate_page(struct address_space *,
 			struct page *, struct page *, enum migrate_mode);
 extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
 		unsigned long private, enum migrate_mode mode, int reason);
-extern bool isolate_movable_page(struct page *page, isolate_mode_t mode);
+extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
 extern void putback_movable_page(struct page *page);
 
 extern int migrate_prep(void);
diff --git a/mm/compaction.c b/mm/compaction.c
index 949198d..1d89147 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -802,7 +802,7 @@ static bool too_many_isolated(struct zone *zone)
 					locked = false;
 				}
 
-				if (isolate_movable_page(page, isolate_mode))
+				if (!isolate_movable_page(page, isolate_mode))
 					goto isolate_success;
 			}
 
diff --git a/mm/migrate.c b/mm/migrate.c
index 87f4d0f..6807174 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -74,7 +74,7 @@ int migrate_prep_local(void)
 	return 0;
 }
 
-bool isolate_movable_page(struct page *page, isolate_mode_t mode)
+int isolate_movable_page(struct page *page, isolate_mode_t mode)
 {
 	struct address_space *mapping;
 
@@ -125,14 +125,14 @@ bool isolate_movable_page(struct page *page, isolate_mode_t mode)
 	__SetPageIsolated(page);
 	unlock_page(page);
 
-	return true;
+	return 0;
 
 out_no_isolated:
 	unlock_page(page);
 out_putpage:
 	put_page(page);
 out:
-	return false;
+	return -EBUSY;
 }
 
 /* It should be called on page which is PG_movable */
-- 
1.7.12.4