linux-kernel - Re: PATCH? trace_remove_event_call() should fail if call is active

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Message-ID: <20130702214109.GA25633@redhat.com>
Date:	Tue, 2 Jul 2013 23:41:09 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: PATCH? trace_remove_event_call() should fail if call is active

On 07/02, Oleg Nesterov wrote:
>
> On 07/02, Steven Rostedt wrote:
> >
> > I'm actually worried about this change.
>
> Me too.
>
> But again. Any reason trace_remove_event_call() should succeed if
> this this ftrace_event_call is active?

And note that kprobes/uprobes are the only users of trace_remove_event_call(),
and both need the same semantics: kill it only if it is not active.

Oleg.

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