| From: Miaohe Lin <linmiaohe@huawei.com> |
| Subject: mm/migration: avoid unneeded nodemask_t initialization |
| |
| Avoid unneeded next_pass and this_pass initialization as they're always |
| set before using to save possible cpu cycles when there are plenty of |
| nodes in the system. |
| |
| Link: https://lkml.kernel.org/r/20220318111709.60311-8-linmiaohe@huawei.com |
| Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> |
| Reviewed-by: Muchun Song <songmuchun@bytedance.com> |
| Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> |
| Cc: Alistair Popple <apopple@nvidia.com> |
| Cc: "Huang, Ying" <ying.huang@intel.com> |
| Cc: Zi Yan <ziy@nvidia.com> |
| Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
| --- |
| |
| mm/migrate.c | 4 ++-- |
| 1 file changed, 2 insertions(+), 2 deletions(-) |
| |
| --- a/mm/migrate.c~mm-migration-avoid-unneeded-nodemask_t-initialization |
| +++ a/mm/migrate.c |
| @@ -2345,8 +2345,8 @@ out_clear: |
| */ |
| static void __set_migration_target_nodes(void) |
| { |
| - nodemask_t next_pass = NODE_MASK_NONE; |
| - nodemask_t this_pass = NODE_MASK_NONE; |
| + nodemask_t next_pass; |
| + nodemask_t this_pass; |
| nodemask_t used_targets = NODE_MASK_NONE; |
| int node, best_distance; |
| |
| _ |
