[PATCH 3/3] do_migrate_range: reduce list_empty() check.

[Bob Liu <lliubbo@xxxxxxxxx>]

simple code for reducing list_empty(&source) check.

Signed-off-by: Bob Liu <lliubbo@xxxxxxxxx>
---
 mm/memory_hotplug.c |   17 +++++++----------
 1 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 4f72184..b6ffcfe 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -718,22 +718,19 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
 			   check this again here. */
 			if (page_count(page)) {
 				not_managed++;
+				ret = -EBUSY;
 				break;
 			}
 		}
 	}
-	ret = -EBUSY;
-	if (not_managed) {
-		if (!list_empty(&source))
+	if (!list_empty(&source)) {
+		if (not_managed) {
 			putback_lru_pages(&source);
-		goto out;
+			goto out;
+		}
+		/* this function returns # of failed pages */
+		ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1);
 	}
-	ret = 0;
-	if (list_empty(&source))
-		goto out;
-	/* this function returns # of failed pages */
-	ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1);
-
 out:
 	return ret;
 }
-- 
1.5.6.3

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