linux-kernel - Re: [PATCH] ftracetest: Take the first debugfs mount found

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Date:	Mon, 03 Nov 2014 17:18:34 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ftracetest: Take the first debugfs mount found

(2014/11/01 7:06), Steven Rostedt wrote:
> 
> Running ftracetests on a box that mounted debugfs in two locations
> made the ftracetests fail. This is because the tests uses a grep
> of debugfs from the /proc/mounts file to find the debugfs mount
> point, and then appends "/tracing" to that string to get the tracing
> directory.
> 
> If the debugfs directory is mounted twice, then that grep will return
> two answers and appending "/tracing" to a string with two lines will
> not work.
> 
> Use "head -1" to only take the first mount point found.

Indeed :)

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

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Thank you!


> ---
>  tools/testing/selftests/ftrace/ftracetest | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
> index a8f81c782856..515247601df4 100755
> --- a/tools/testing/selftests/ftrace/ftracetest
> +++ b/tools/testing/selftests/ftrace/ftracetest
> @@ -82,7 +82,7 @@ parse_opts() { # opts
>  }
>  
>  # Parameters
> -DEBUGFS_DIR=`grep debugfs /proc/mounts | cut -f2 -d' '`
> +DEBUGFS_DIR=`grep debugfs /proc/mounts | cut -f2 -d' ' | head -1`
>  TRACING_DIR=$DEBUGFS_DIR/tracing
>  TOP_DIR=`absdir $0`
>  TEST_DIR=$TOP_DIR/test.d
> 


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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