[RFC PATCH 03/11] bpf: export proto for bpf_perf_event_output helper
From: Kris Van Hees <hidden>
Date: 2019-05-21 20:40:29
Also in:
bpf, lkml
Subsystem:
bpf [core], bpf [general] (safe dynamic programs and tools), bpf [security & lsm] (security audit and enforcement using bpf), bpf [tracing], the rest, tracing · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, KP Singh, Matt Bobrowski, Song Liu, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
The bpf_perf_event_output helper is used by various tracer BPF program types, but it was not visible outside of bpf_trace.c. In order to make it available to tracer BPF program types that are implemented elsewhere, a function is added similar to bpf_get_trace_printk_proto() to query the prototype (bpf_get_perf_event_output_proto()). Signed-off-by: Kris Van Hees <redacted> Reviewed-by: Nick Alcock <redacted> --- include/linux/bpf.h | 1 + kernel/trace/bpf_trace.c | 6 ++++++ 2 files changed, 7 insertions(+)
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 7a40a3cd7ff2..e4bcb79656c4 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h@@ -479,6 +479,7 @@ bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *f int bpf_prog_calc_tag(struct bpf_prog *fp); const struct bpf_func_proto *bpf_get_trace_printk_proto(void); +const struct bpf_func_proto *bpf_get_perf_event_output_proto(void); typedef unsigned long (*bpf_ctx_copy_t)(void *dst, const void *src, unsigned long off, unsigned long len);
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index b496ffdf5f36..3d812238bc40 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c@@ -473,6 +473,12 @@ static const struct bpf_func_proto bpf_perf_event_output_proto = { .arg5_type = ARG_CONST_SIZE_OR_ZERO, }; +const struct bpf_func_proto *bpf_get_perf_event_output_proto(void) +{ + return &bpf_perf_event_output_proto; +} + + static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs); static DEFINE_PER_CPU(struct perf_sample_data, bpf_misc_sd);
--
2.20.1