[PATCH bpf-next v4 19/30] bpf: eliminate rlimit-based memory accounting for hashtab maps

[Roman Gushchin]

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

Signed-off-by: Roman Gushchin <guro@xxxxxx>
Acked-by: Song Liu <songliubraving@xxxxxx>
---
 kernel/bpf/hashtab.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/kernel/bpf/hashtab.c b/kernel/bpf/hashtab.c
index c2651cbce516..f3eb40a4d13c 100644
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -422,7 +422,6 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
 	bool percpu_lru = (attr->map_flags & BPF_F_NO_COMMON_LRU);
 	bool prealloc = !(attr->map_flags & BPF_F_NO_PREALLOC);
 	struct bpf_htab *htab;
-	u64 cost;
 	int err;
 
 	htab = kzalloc(sizeof(*htab), GFP_USER | __GFP_ACCOUNT);
@@ -459,26 +458,12 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
 	    htab->n_buckets > U32_MAX / sizeof(struct bucket))
 		goto free_htab;
 
-	cost = (u64) htab->n_buckets * sizeof(struct bucket) +
-	       (u64) htab->elem_size * htab->map.max_entries;
-
-	if (percpu)
-		cost += (u64) round_up(htab->map.value_size, 8) *
-			num_possible_cpus() * htab->map.max_entries;
-	else
-	       cost += (u64) htab->elem_size * num_possible_cpus();
-
-	/* if map size is larger than memlock limit, reject it */
-	err = bpf_map_charge_init(&htab->map.memory, cost);
-	if (err)
-		goto free_htab;
-
 	err = -ENOMEM;
 	htab->buckets = bpf_map_area_alloc(htab->n_buckets *
 					   sizeof(struct bucket),
 					   htab->map.numa_node);
 	if (!htab->buckets)
-		goto free_charge;
+		goto free_htab;
 
 	if (htab->map.map_flags & BPF_F_ZERO_SEED)
 		htab->hashrnd = 0;
@@ -508,8 +493,6 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
 	prealloc_destroy(htab);
 free_buckets:
 	bpf_map_area_free(htab->buckets);
-free_charge:
-	bpf_map_charge_finish(&htab->map.memory);
 free_htab:
 	kfree(htab);
 	return ERR_PTR(err);
-- 
2.26.2