1// SPDX-License-Identifier: GPL-2.0
2#include <vmlinux.h>
3#include <bpf/bpf_tracing.h>
4#include <bpf/bpf_helpers.h>
5
6struct task_ls_map {
7 __uint(type, BPF_MAP_TYPE_TASK_STORAGE);
8 __uint(map_flags, BPF_F_NO_PREALLOC);
9 __type(key, int);
10 __type(value, int);
11} task_ls_map SEC(".maps");
12
13long gp_seq;
14
15SEC("syscall")
16int do_call_rcu_tasks_trace(void *ctx)
17{
18 struct task_struct *current;
19 int *v;
20
21 current = bpf_get_current_task_btf();
22 v = bpf_task_storage_get(&task_ls_map, current, NULL, BPF_LOCAL_STORAGE_GET_F_CREATE);
23 if (!v)
24 return 1;
25 /* Invoke call_rcu_tasks_trace */
26 return bpf_task_storage_delete(&task_ls_map, current);
27}
28
29SEC("kprobe/rcu_tasks_trace_postgp")
30int rcu_tasks_trace_postgp(void *ctx)
31{
32 __sync_add_and_fetch(&gp_seq, 1);
33 return 0;
34}
35
36char _license[] SEC("license") = "GPL";
37

source code of linux/tools/testing/selftests/bpf/progs/rcu_tasks_trace_gp.c