mm: memcontrol: simplify soft limit tree init code
- No need to test the node for N_MEMORY. node_online() is enough for
node fallback to work in slab, use NUMA_NO_NODE for everything else.
- Remove the BUG_ON() for allocation failure. A NULL pointer crash is
just as descriptive, and the absent return value check is obvious.
- Move local variables to the inner-most blocks.
- Point to the tree structure after its initialized, not before, it's
just more logical that way.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Christoph Lameter <cl@linux-foundation.org>
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 fbf64e6..2efec68 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4509,24 +4509,23 @@
static void __init mem_cgroup_soft_limit_tree_init(void)
{
- struct mem_cgroup_tree_per_node *rtpn;
- struct mem_cgroup_tree_per_zone *rtpz;
- int tmp, node, zone;
+ int node;
for_each_node(node) {
- tmp = node;
- if (!node_state(node, N_NORMAL_MEMORY))
- tmp = -1;
- rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
- BUG_ON(!rtpn);
+ struct mem_cgroup_tree_per_node *rtpn;
+ int zone;
- soft_limit_tree.rb_tree_per_node[node] = rtpn;
+ rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
+ node_online(node) ? node : NUMA_NO_NODE);
for (zone = 0; zone < MAX_NR_ZONES; zone++) {
+ struct mem_cgroup_tree_per_zone *rtpz;
+
rtpz = &rtpn->rb_tree_per_zone[zone];
rtpz->rb_root = RB_ROOT;
spin_lock_init(&rtpz->lock);
}
+ soft_limit_tree.rb_tree_per_node[node] = rtpn;
}
}