From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Wed, 18 May 2022 22:59:08 +0200
Subject: bpf: Allow kfunc in tracing and syscall programs.
Patch-mainline: v5.19-rc1
Git-commit: 979497674e63666a99fd7d242dba53a5ca5d628b
References: jsc#PED-1377

Tracing and syscall BPF program types are very convenient to add BPF
capabilities to subsystem otherwise not BPF capable.
When we add kfuncs capabilities to those program types, we can add
BPF features to subsystems without having to touch BPF core.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20220518205924.399291-2-benjamin.tissoires@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 kernel/bpf/btf.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -202,6 +202,8 @@ enum btf_kfunc_hook {
 	BTF_KFUNC_HOOK_XDP,
 	BTF_KFUNC_HOOK_TC,
 	BTF_KFUNC_HOOK_STRUCT_OPS,
+	BTF_KFUNC_HOOK_TRACING,
+	BTF_KFUNC_HOOK_SYSCALL,
 	BTF_KFUNC_HOOK_MAX,
 };
 
@@ -7110,6 +7112,10 @@ static int bpf_prog_type_to_kfunc_hook(e
 		return BTF_KFUNC_HOOK_TC;
 	case BPF_PROG_TYPE_STRUCT_OPS:
 		return BTF_KFUNC_HOOK_STRUCT_OPS;
+	case BPF_PROG_TYPE_TRACING:
+		return BTF_KFUNC_HOOK_TRACING;
+	case BPF_PROG_TYPE_SYSCALL:
+		return BTF_KFUNC_HOOK_SYSCALL;
 	default:
 		return BTF_KFUNC_HOOK_MAX;
 	}