From: Dmitry Safonov <0x7f454c46@gmail.com> Date: Mon, 19 Oct 2015 18:10:26 +0000 (+0300) Subject: tracing: Remove redundant reset per-CPU buff in irqsoff tracer X-Git-Tag: v4.6-rc1~28^2~2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=741f3a69f101250dc6b171b88e14ea51b099b1a9;p=karo-tx-linux.git tracing: Remove redundant reset per-CPU buff in irqsoff tracer There is no reason to do it twice: from commit b6f11df26fdc28 ("trace: Call tracing_reset_online_cpus before tracer->init()") resetting of per-CPU buffers done before tracer->init() call. tracer->init() calls {irqs,preempt,preemptirqs}off_tracer_init() and it calls __irqsoff_tracer_init(), which resets per-CPU ringbuffer second time. It's slowpath, but anyway. Link: http://lkml.kernel.org/r/1445278226-16187-1-git-send-email-0x7f454c46@gmail.com Signed-off-by: Dmitry Safonov <0x7f454c46@gmail.com> Signed-off-by: Steven Rostedt --- diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c index be3222b7d72e..03cdff84d026 100644 --- a/kernel/trace/trace_irqsoff.c +++ b/kernel/trace/trace_irqsoff.c @@ -626,7 +626,6 @@ static int __irqsoff_tracer_init(struct trace_array *tr) irqsoff_trace = tr; /* make sure that the tracer is visible */ smp_wmb(); - tracing_reset_online_cpus(&tr->trace_buffer); ftrace_init_array_ops(tr, irqsoff_tracer_call);