memcg: do not tweak node in alloc_mem_cgroup_per_node_info

alloc_mem_cgroup_per_node_info is allocated for each possible node and
this used to be a problem because !node_online nodes didn't have
appropriate data structure allocated.  This has changed by "mm: handle
uninitialized numa nodes gracefully" so we can drop the special casing
here.

Link: https://lkml.kernel.org/r/20220127085305.20890-7-mhocko@kernel.org
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Alexey Makhalov <amakhalov@vmware.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Rafael Aquini <raquini@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 33ad13d..f5ad1a6 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5020,18 +5020,8 @@ struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
 static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 {
        struct mem_cgroup_per_node *pn;
-       int tmp = node;
-       /*
-        * This routine is called against possible nodes.
-        * But it's BUG to call kmalloc() against offline node.
-        *
-        * TODO: this routine can waste much memory for nodes which will
-        *       never be onlined. It's better to use memory hotplug callback
-        *       function.
-        */
-       if (!node_state(node, N_NORMAL_MEMORY))
-               tmp = -1;
-       pn = kzalloc_node(sizeof(*pn), GFP_KERNEL, tmp);
+
+       pn = kzalloc_node(sizeof(*pn), GFP_KERNEL, node);
        if (!pn)
                return 1;