From b8820084f2130b3dcfb09c78ac16cdd2194a345b Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Date: Thu, 9 May 2013 14:44:54 +0900 Subject: [PATCH] tracing/kprobes: Support soft-mode disabling Support soft-mode disabling on kprobe-based dynamic events. Soft-disabling is just ignoring recording if the soft disabled flag is set. Link: http://lkml.kernel.org/r/20130509054454.30398.7237.stgit@mhiramat-M0-7522 Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Tom Zanussi <tom.zanussi@intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- kernel/trace/trace_kprobe.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index fee865d8a7c403..636d45fe69b37a 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -845,6 +845,9 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs, WARN_ON(call != ftrace_file->event_call); + if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) + return; + local_save_flags(irq_flags); pc = preempt_count(); @@ -893,6 +896,9 @@ __kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri, WARN_ON(call != ftrace_file->event_call); + if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags)) + return; + local_save_flags(irq_flags); pc = preempt_count(); -- GitLab