diff options
| author | Kefeng Wang <wangkefeng.wang@huawei.com> | 2019-09-23 15:37:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-24 15:54:10 -0700 |
| commit | 4406548ee39c2268876b61a927acad45da6f9aef (patch) | |
| tree | c4e9b9d44d51012998347e5e473e620120059f42 /mm/mempolicy.c | |
| parent | 32aaf0553df99cc4314f6e9f43216cd83afc6c20 (diff) | |
| download | linux-4406548ee39c2268876b61a927acad45da6f9aef.tar.gz | |
mm/mempolicy.c: remove unnecessary nodemask check in kernel_migrate_pages()
1) task_nodes = cpuset_mems_allowed(current);
-> cpuset_mems_allowed() guaranteed to return some non-empty
subset of node_states[N_MEMORY].
2) nodes_and(*new, *new, task_nodes);
-> after nodes_and(), the 'new' should be empty or appropriate
nodemask(online node and with memory).
After 1) and 2), we could remove unnecessary check whether the 'new'
AND node_states[N_MEMORY] is empty.
Link: http://lkml.kernel.org/r/20190806023634.55356-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index f000771558d8..464406e8da91 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1512,10 +1512,6 @@ static int kernel_migrate_pages(pid_t pid, unsigned long maxnode, if (nodes_empty(*new)) goto out_put; - nodes_and(*new, *new, node_states[N_MEMORY]); - if (nodes_empty(*new)) - goto out_put; - err = security_task_movememory(task); if (err) goto out_put; |