From mboxrd@z Thu Jan 1 00:00:00 1970 From: Masami Hiramatsu Subject: [RFC PATCH v2 04/15] tracing: kprobes: Register to dynevent earlier stage Date: Mon, 15 Jul 2019 14:11:52 +0900 Message-ID: <156316751189.23477.5849503344032872544.stgit@devnote2> References: <156316746861.23477.5815110570539190650.stgit@devnote2> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <156316746861.23477.5815110570539190650.stgit@devnote2> Sender: linux-kernel-owner@vger.kernel.org To: Steven Rostedt , Rob Herring , Frank Rowand , Tim Bird Cc: Ingo Molnar , Namhyung Kim , Jiri Olsa , Arnaldo Carvalho de Melo , Tom Zanussi , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org Register kprobe event to dynevent in subsys_initcall level. This will allow kernel to register new kprobe events in fs_initcall level via trace_run_command. Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_kprobe.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 6c5145525f90..5135c07b6557 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1484,11 +1484,12 @@ static __init void setup_boot_kprobe_events(void) enable_boot_kprobe_events(); } -/* Make a tracefs interface for controlling probe points */ -static __init int init_kprobe_trace(void) +/* + * Register dynevent at subsys_initcall. This allows kernel to setup kprobe + * events in fs_initcall without tracefs. + */ +static __init int init_kprobe_trace_early(void) { - struct dentry *d_tracer; - struct dentry *entry; int ret; ret = dyn_event_register(&trace_kprobe_ops); @@ -1498,6 +1499,16 @@ static __init int init_kprobe_trace(void) if (register_module_notifier(&trace_kprobe_module_nb)) return -EINVAL; + return 0; +} +subsys_initcall(init_kprobe_trace_early); + +/* Make a tracefs interface for controlling probe points */ +static __init int init_kprobe_trace(void) +{ + struct dentry *d_tracer; + struct dentry *entry; + d_tracer = tracing_init_dentry(); if (IS_ERR(d_tracer)) return 0;