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Subject[PATCH 1/5] mm: stop returning -ENOENT from sys_move_pages() if nothing got migrated
There is no point in returning -ENOENT from sys_move_pages() if all
pages were already on the right node, while we return 0 if only 1 page
was not. Most application don't know where their pages are allocated,
so it's not an error to try to migrate them anyway.

Just return 0 and let the status array in user-space be checked if the
application needs details.

It will make the upcoming chunked-move_pages() support much easier.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
---
mm/migrate.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 2a80136..e505b2f 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -926,11 +926,10 @@ set_status:
pp->status = err;
}

+ err = 0;
if (!list_empty(&pagelist))
err = migrate_pages(&pagelist, new_page_node,
(unsigned long)pm);
- else
- err = -ENOENT;

up_read(&mm->mmap_sem);
return err;
--
1.5.6.5




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