linux-kernel - Re: [RFA][PATCH 05/27] ftrace/x86: Add call to ftrace_graph_is

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Message-ID: <53C54D18.3020602@zytor.com>
Date:	Tue, 15 Jul 2014 08:47:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org
CC:	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-arch@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Jiri Kosina <jkosina@...e.cz>,
	Josh Poimboeuf <notifications@...hub.com>
Subject: Re: [RFA][PATCH 05/27] ftrace/x86: Add call to ftrace_graph_is_dead()
 in function graph code

On 06/26/2014 09:52 AM, Steven Rostedt wrote:
> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> ftrace_stop() is going away as it disables parts of function tracing
> that affects users that should not be affected. But ftrace_graph_stop()
> is built on ftrace_stop(). Here's another example of killing all of
> function tracing because something went wrong with function graph
> tracing.
> 
> Instead of disabling all users of function tracing on function graph
> error, disable only function graph tracing. To do this, the arch code
> must call ftrace_graph_is_dead() before it implements function graph.
> 
> Cc: H. Peter Anvin <hpa@...or.com>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

Acked-by: H. Peter Anvin <hpa@...ux.intel.com>

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