linux-kernel - Re: [PATCH] ftracetest: Cope properly with stack tracer not being enabled

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Date:	Mon, 30 Mar 2015 17:36:33 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	shuahkh@....samsung.com, <linux-kernel@...r.kernel.org>,
	davej@...emonkey.org.uk, namhyung@...nel.org
Subject: Re: [PATCH] ftracetest: Cope properly with stack tracer not being
 enabled

On Mon, 30 Mar 2015 16:21:40 +1100
Michael Ellerman <mpe@...erman.id.au> wrote:

> If the stack tracer (CONFIG_STACK_TRACER) is disabled, the
> fgraph-filter-stack test blows chunks:
> 
>   [8] ftrace - function graph filters with stack tracer	[FAIL]
>   + reset_tracer
>   + echo nop
>   ./ftracetest: 19: /home/michael/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc:
>   	cannot create /proc/sys/kernel/stack_tracer_enabled: Directory nonexistent
> 
> Fix it by checking if the proc file exists before echoing to it. With
> the patch applied it fails correctly with:
> 
>   [8] ftrace - function graph filters with stack tracer	[UNSUPPORTED]
> 
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve
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