linux-kernel - [Patch v3 1/4] mm/migrate.c: not necessary to check start and i

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Date:   Sun, 26 Jan 2020 18:26:20 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     akpm@...ux-foundation.org
Cc:     mhocko@...e.com, yang.shi@...ux.alibaba.com, rientjes@...gle.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: [Patch v3 1/4] mm/migrate.c: not necessary to check start and i

Till here, i must no less than start. And if i equals to start,
store_status() would always return 0.

Remove some unnecessary check to make it easy to read and prepare for
further cleanup.

Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
Acked-by: Michal Hocko <mhocko@...e.com>
---
 mm/migrate.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 6a6c8f247bce..ae3db45c6a42 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1674,11 +1674,9 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
 				err += nr_pages - i - 1;
 			goto out;
 		}
-		if (i > start) {
-			err = store_status(status, start, current_node, i - start);
-			if (err)
-				goto out;
-		}
+		err = store_status(status, start, current_node, i - start);
+		if (err)
+			goto out;
 		current_node = NUMA_NO_NODE;
 	}
 out_flush:
-- 
2.17.1