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authorWei Yang <richardw.yang@linux.intel.com>2020-04-06 20:04:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-07 10:43:38 -0700
commit7ca8783ad816972f0c64a189b8ba6615c6b78521 (patch)
treed4d7c3c04260d7393c866eedebfd0590f32014a5 /mm/migrate.c
parent4afdacec2e313509bf9c25f3370be299a0d60b9a (diff)
mm/migrate.c: wrap do_move_pages_to_node() and store_status()
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> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Link: http://lkml.kernel.org/r/20200214003017.25558-3-richardw.yang@linux.intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r--mm/migrate.c61
1 files changed, 29 insertions, 32 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 20bc562f499e..6f6317903007 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1602,6 +1602,29 @@ out:
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 i, unsigned long nr_pages)
+{
+ int err;
+
+ err = do_move_pages_to_node(mm, pagelist, node);
+ if (err) {
+ /*
+ * Positive err means the number of failed
+ * pages to migrate. Since we are going to
+ * abort and return the number of non-migrated
+ * pages, so need to incude the rest of the
+ * nr_pages that have not been attempted as
+ * well.
+ */
+ if (err > 0)
+ err += nr_pages - i - 1;
+ return err;
+ }
+ return store_status(status, start, node, i - start);
+}
+
/*
* Migrate an array of page address onto an array of nodes and fill
* the corresponding array of status.
@@ -1645,21 +1668,8 @@ 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) {
- /*
- * Positive err means the number of failed
- * pages to migrate. Since we are going to
- * abort and return the number of non-migrated
- * pages, so need to incude the rest of the
- * nr_pages that have not been attempted as
- * well.
- */
- if (err > 0)
- err += nr_pages - i - 1;
- goto out;
- }
- err = store_status(status, start, current_node, i - start);
+ err = move_pages_and_store_status(mm, current_node,
+ &pagelist, status, start, i, nr_pages);
if (err)
goto out;
start = i;
@@ -1688,13 +1698,8 @@ 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) {
- if (err > 0)
- err += nr_pages - i - 1;
- goto out;
- }
- err = store_status(status, start, current_node, i - start);
+ err = move_pages_and_store_status(mm, current_node, &pagelist,
+ status, start, i, nr_pages);
if (err)
goto out;
current_node = NUMA_NO_NODE;
@@ -1704,16 +1709,8 @@ out_flush:
return err;
/* Make sure we do not overwrite the existing error */
- err1 = do_move_pages_to_node(mm, &pagelist, current_node);
- /*
- * Don't have to report non-attempted pages here since:
- * - If the above loop is done gracefully all pages have been
- * attempted.
- * - If the above loop is aborted it means a fatal error
- * happened, should return ret.
- */
- if (!err1)
- err1 = store_status(status, start, current_node, i - start);
+ err1 = move_pages_and_store_status(mm, current_node, &pagelist,
+ status, start, i, nr_pages);
if (err >= 0)
err = err1;
out: