# \[PATCH net-next 3/3\] bpf: let kprobe programs use bpf\_get\_smp\_processor\_id() helper

- From: Alexei Starovoitov \<hidden\>
- Date: 2015-06-12 21:40:46 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2015/06/4515093
- Thread: https://ratatoskr.run/linux-api/2015/06/4515090/t.md

```text
It's useful to do per-cpu histograms.

Suggested-by: Daniel Wagner <redacted>
Signed-off-by: Alexei Starovoitov <redacted>
---
 kernel/trace/bpf_trace.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 4f9b5d41869b..88a041adee90 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -181,6 +181,8 @@ static const struct bpf_func_proto *kprobe_prog_func_proto(enum bpf_func_id func
 		return &bpf_get_current_comm_proto;
 	case BPF_FUNC_trace_printk:
 		return bpf_get_trace_printk_proto();
+	case BPF_FUNC_get_smp_processor_id:
+		return &bpf_get_smp_processor_id_proto;
 	default:
 		return NULL;
 	}
-- 
1.7.9.5
```