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authorKefeng Wang <wangkefeng.wang@huawei.com>2019-09-23 15:37:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-24 15:54:10 -0700
commit4406548ee39c2268876b61a927acad45da6f9aef (patch)
treec4e9b9d44d51012998347e5e473e620120059f42 /mm/mempolicy.c
parent32aaf0553df99cc4314f6e9f43216cd83afc6c20 (diff)
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.c4
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;