bpf: add helper for copying attrs to struct bpf_map

All map types reimplement the field-by-field copy of union bpf_attr
members into struct bpf_map.  Add a helper to perform this operation.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 1 insertions, 5 deletions

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 6c63c2222ea8..b0ecf43f5894 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -88,14 +88,10 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
         if (cost >= U32_MAX - PAGE_SIZE)
                 goto free_smap;
 
-        smap->map.map_type = attr->map_type;
-        smap->map.key_size = attr->key_size;
+        bpf_map_init_from_attr(&smap->map, attr);
         smap->map.value_size = value_size;
-        smap->map.max_entries = attr->max_entries;
-        smap->map.map_flags = attr->map_flags;
         smap->n_buckets = n_buckets;
         smap->map.pages = round_up(cost, PAGE_SIZE) >> PAGE_SHIFT;
-        smap->map.numa_node = bpf_map_attr_numa_node(attr);
 
         err = bpf_map_precharge_memlock(smap->map.pages);
         if (err)