From: Yonghong Song <yhs@fb.com>
Date: Tue, 23 Jun 2020 16:08:08 -0700
Subject: bpf: Allow tracing programs to use bpf_jiffies64() helper
Patch-mainline: v5.9-rc1
Git-commit: 72e2b2b66f9c1225e51fc4a1c1e8512959195b76
References: bsc#1177028

/proc/net/tcp{4,6} uses jiffies for various computations.
Let us add bpf_jiffies64() helper to tracing program
so bpf_iter and other programs can use it.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200623230808.3988073-1-yhs@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
 kernel/trace/bpf_trace.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1098,6 +1098,8 @@ bpf_tracing_func_proto(enum bpf_func_id
 		return &bpf_ringbuf_discard_proto;
 	case BPF_FUNC_ringbuf_query:
 		return &bpf_ringbuf_query_proto;
+	case BPF_FUNC_jiffies64:
+		return &bpf_jiffies64_proto;
 	default:
 		return NULL;
 	}