Preemption is disabled in ftrace graph, which indicate rcu_read_lock. So the rcu_read_lock is not needed in fprobe_entry(), and it is not needed in kprobe_multi_link_prog_run() neither. Signed-off-by: Menglong Dong <dongml2@xxxxxxxxxxxxxxx> --- kernel/trace/bpf_trace.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 606007c387c5..0e79fa84a634 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2741,12 +2741,10 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link, goto out; } - rcu_read_lock(); regs = ftrace_partial_regs(fregs, bpf_kprobe_multi_pt_regs_ptr()); old_run_ctx = bpf_set_run_ctx(&run_ctx.session_ctx.run_ctx); err = bpf_prog_run(link->link.prog, regs); bpf_reset_run_ctx(old_run_ctx); - rcu_read_unlock(); out: __this_cpu_dec(bpf_prog_active); -- 2.51.0
