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tracing: Remove ftrace_stop/start() from reading the trace file

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commit 099ed15167 upstream.

Disabling reading and writing to the trace file should not be able to
disable all function tracing callbacks. There's other users today
(like kprobes and perf). Reading a trace file should not stop those
from happening.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-06-24 23:50:09 -04:00 committed by Greg Kroah-Hartman
parent fa1bd9b16b
commit bf09db9720
1 changed files with 0 additions and 2 deletions
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2
kernel/trace/trace.c
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@ -1052,7 +1052,6 @@ void tracing_start(void)
arch_spin_unlock(&ftrace_max_lock);
ftrace_start();
out:
raw_spin_unlock_irqrestore(&tracing_start_lock, flags);
}
@ -1068,7 +1067,6 @@ void tracing_stop(void)
struct ring_buffer *buffer;
unsigned long flags;
ftrace_stop();
raw_spin_lock_irqsave(&tracing_start_lock, flags);
if (trace_stop_count++)
goto out;