linux-kernel - Re: [PATCH 1/7] ftrace: Change filter/notrace set functions to return exit code

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Message-ID: <20120119163124.GA18056@somewhere>
Date:	Thu, 19 Jan 2012 17:31:28 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	rostedt@...dmis.org, mingo@...hat.com, paulus@...ba.org,
	acme@...stprotocols.net, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, aarapov@...hat.com
Subject: Re: [PATCH 1/7] ftrace: Change filter/notrace set functions to
 return exit code

On Wed, Jan 18, 2012 at 07:44:29PM +0100, Jiri Olsa wrote:
> Currently the ftrace_set_filter and ftrace_set_notrace functions
> do not return any return code. So there's no way for ftrace_ops
> user to tell wether the filter was correctly applied.
> 
> The set_ftrace_filter interface returns error in case the filter
> did not match:
> 
>   # echo krava > set_ftrace_filter
>   bash: echo: write error: Invalid argument
> 
> Changing both ftrace_set_filter and ftrace_set_notrace functions
> to return zero if the filter was applied correctly or -E* values
> in case of error.
> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>

Acked-by: Frederic Weisbecker <fweisbec@...il.com>
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