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mm: use nodes_and() return value to simplify client code 

establish_demotion_targets() and kernel_migrate_pages() call node_empty()
immediately after calling nodes_and().  Now that nodes_and() return false
if nodemask is empty, drop the latter.

Link: https://lkml.kernel.org/r/20260114172217.861204-3-ynorov@nvidia.com
Signed-off-by: Yury Norov <ynorov@nvidia.com>
Reviewed-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mathew Brost <matthew.brost@intel.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yury Norov 2026-01-14 12:22:14 -05:00 committed by Andrew Morton
parent cbc064e708
commit 386781df63
2 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
mm/memory-tiers.c
View File

@ -475,8 +475,7 @@ static void establish_demotion_targets(void)
*/
list_for_each_entry_reverse(memtier, &memory_tiers, list) {
tier_nodes = get_memtier_nodemask(memtier);
nodes_and(tier_nodes, node_states[N_CPU], tier_nodes);
if (!nodes_empty(tier_nodes)) {
if (nodes_and(tier_nodes, node_states[N_CPU], tier_nodes)) {
/*
* abstract distance below the max value of this memtier
* is considered toptier.

3
mm/mempolicy.c
View File

@ -1909,8 +1909,7 @@ static int kernel_migrate_pages(pid_t pid, unsigned long maxnode,
}
task_nodes = cpuset_mems_allowed(current);
nodes_and(*new, *new, task_nodes);
if (nodes_empty(*new))
if (!nodes_and(*new, *new, task_nodes))
goto out_put;
err = security_task_movememory(task);