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1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2020 Facebook */3#include "bpf_iter.h"4#include <bpf/bpf_helpers.h>5 6char _license[] SEC("license") = "GPL";7 8__u32 value_sum = 0;9 10SEC("iter/bpf_map_elem")11int dump_bpf_hash_map(struct bpf_iter__bpf_map_elem *ctx)12{13 void *value = ctx->value;14 15 if (value == (void *)0)16 return 0;17 18 /* negative offset, verifier failure. */19 value_sum += *(__u32 *)(value - 4);20 return 0;21}22