bpf: Eliminate rlimit-based memory accounting for stackmap maps

Do not use rlimit-based memory accounting for stackmap maps.
It has been replaced with the memcg-based memory accounting.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20201201215900.3569844-30-guro@fb.com

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 06065fa..3325add 100644 (file)
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -90,7 +90,6 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
 {
        u32 value_size = attr->value_size;
        struct bpf_stack_map *smap;
-       struct bpf_map_memory mem;
        u64 cost, n_buckets;
        int err;
 
@@ -119,15 +118,9 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
 
        cost = n_buckets * sizeof(struct stack_map_bucket *) + sizeof(*smap);
        cost += n_buckets * (value_size + sizeof(struct stack_map_bucket));
-       err = bpf_map_charge_init(&mem, cost);
-       if (err)
-               return ERR_PTR(err);
-
        smap = bpf_map_area_alloc(cost, bpf_map_attr_numa_node(attr));
-       if (!smap) {
-               bpf_map_charge_finish(&mem);
+       if (!smap)
                return ERR_PTR(-ENOMEM);
-       }
 
        bpf_map_init_from_attr(&smap->map, attr);
        smap->map.value_size = value_size;
@@ -135,20 +128,17 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
 
        err = get_callchain_buffers(sysctl_perf_event_max_stack);
        if (err)
-               goto free_charge;
+               goto free_smap;
 
        err = prealloc_elems_and_freelist(smap);
        if (err)
                goto put_buffers;
 
-       bpf_map_charge_move(&smap->map.memory, &mem);
-
        return &smap->map;
 
 put_buffers:
        put_callchain_buffers();
-free_charge:
-       bpf_map_charge_finish(&mem);
+free_smap:
        bpf_map_area_free(smap);
        return ERR_PTR(err);
 }