From: Song Liu <songliubraving@fb.com>
Date: Fri, 14 Feb 2020 15:41:46 -0800
Subject: bpf: Allow bpf_perf_event_read_value in all BPF programs
Patch-mainline: v5.7-rc1
Git-commit: b80b033bedae68dae8fc703ab8a69811ce678f2e
References: bsc#1177028
bpf_perf_event_read_value() is NMI safe. Enable it for all BPF programs.
This can be used in fentry/fexit to profile BPF program and individual
kernel function with hardware counters.
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200214234146.2910011-1-songliubraving@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
kernel/trace/bpf_trace.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -843,6 +843,8 @@ tracing_func_proto(enum bpf_func_id func
return &bpf_send_signal_proto;
case BPF_FUNC_send_signal_thread:
return &bpf_send_signal_thread_proto;
+ case BPF_FUNC_perf_event_read_value:
+ return &bpf_perf_event_read_value_proto;
default:
return NULL;
}
@@ -858,8 +860,6 @@ kprobe_prog_func_proto(enum bpf_func_id
return &bpf_get_stackid_proto;
case BPF_FUNC_get_stack:
return &bpf_get_stack_proto;
- case BPF_FUNC_perf_event_read_value:
- return &bpf_perf_event_read_value_proto;
#ifdef CONFIG_BPF_KPROBE_OVERRIDE
case BPF_FUNC_override_return:
return &bpf_override_return_proto;