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Subject[Patch v4 2/4] mm/migrate.c: wrap do_move_pages_to_node() and store_status()
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Usually, do_move_pages_to_node() and store_status() are used in
combination. We have three similar call sites.

Let's provide a wrapper for both function calls -
move_pages_and_store_status - to make the calling code easier to
maintain and fix (as noted by Yang Shi, the return value handling of
do_move_pages_to_node() has a flaw).

[david@redhat.com rephrase changelog]

Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
mm/migrate.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 4c2a21856717..92e8c9396368 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1583,6 +1583,18 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
return err;
}

+static int move_pages_and_store_status(struct mm_struct *mm, int node,
+ struct list_head *pagelist, int __user *status,
+ int start, int nr)
+{
+ int err;
+
+ err = do_move_pages_to_node(mm, pagelist, node);
+ if (err)
+ return err;
+ return store_status(status, start, node, nr);
+}
+
/*
* Migrate an array of page address onto an array of nodes and fill
* the corresponding array of status.
@@ -1626,10 +1638,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
current_node = node;
start = i;
} else if (node != current_node) {
- err = do_move_pages_to_node(mm, &pagelist, current_node);
- if (err)
- goto out;
- err = store_status(status, start, current_node, i - start);
+ err = move_pages_and_store_status(mm, current_node,
+ &pagelist, status, start, i - start);
if (err)
goto out;
start = i;
@@ -1658,10 +1668,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
if (err)
goto out_flush;

- err = do_move_pages_to_node(mm, &pagelist, current_node);
- if (err)
- goto out;
- err = store_status(status, start, current_node, i - start);
+ err = move_pages_and_store_status(mm, current_node, &pagelist,
+ status, start, i - start);
if (err)
goto out;
current_node = NUMA_NO_NODE;
@@ -1671,9 +1679,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
return err;

/* Make sure we do not overwrite the existing error */
- err1 = do_move_pages_to_node(mm, &pagelist, current_node);
- if (!err1)
- err1 = store_status(status, start, current_node, i - start);
+ err1 = move_pages_and_store_status(mm, current_node, &pagelist,
+ status, start, i - start);
if (err >= 0)
err = err1;
out:
--
2.17.1
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