bpf: Simplify cases in bpf_base_func_proto

!perfmon_capable() is checked before the last switch(func_id) in
bpf_base_func_proto. Thus, the cases BPF_FUNC_trace_printk and
BPF_FUNC_snprintf_btf can be moved to that last switch(func_id) to omit
the inline !perfmon_capable() checks.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210127174615.3038-1-tklauser@distanz.ch

kernel/bpf/helpers.c

@@ -720,14 +720,6 @@ bpf_base_func_proto(enum bpf_func_id func_id)
 		return &bpf_spin_lock_proto;
 	case BPF_FUNC_spin_unlock:
 		return &bpf_spin_unlock_proto;
-	case BPF_FUNC_trace_printk:
-		if (!perfmon_capable())
-			return NULL;
-		return bpf_get_trace_printk_proto();
-	case BPF_FUNC_snprintf_btf:
-		if (!perfmon_capable())
-			return NULL;
-		return &bpf_snprintf_btf_proto;
 	case BPF_FUNC_jiffies64:
 		return &bpf_jiffies64_proto;
 	case BPF_FUNC_per_cpu_ptr:
@@ -742,6 +734,8 @@ bpf_base_func_proto(enum bpf_func_id func_id)
 		return NULL;
 
 	switch (func_id) {
+	case BPF_FUNC_trace_printk:
+		return bpf_get_trace_printk_proto();
 	case BPF_FUNC_get_current_task:
 		return &bpf_get_current_task_proto;
 	case BPF_FUNC_probe_read_user:
@@ -752,6 +746,8 @@ bpf_base_func_proto(enum bpf_func_id func_id)
 		return &bpf_probe_read_user_str_proto;
 	case BPF_FUNC_probe_read_kernel_str:
 		return &bpf_probe_read_kernel_str_proto;
+	case BPF_FUNC_snprintf_btf:
+		return &bpf_snprintf_btf_proto;
 	default:
 		return NULL;
 	}