linux-kernel - Re: [PATCHv2 07/10] ftrace: Change filter/notrace set functions to return exit code

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Date:	Mon, 19 Dec 2011 14:22:16 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	fweisbec@...il.com, mingo@...hat.com, paulus@...ba.org,
	acme@...stprotocols.net, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, aarapov@...hat.com
Subject: Re: [PATCHv2 07/10] ftrace: Change filter/notrace set functions to
 return exit code

On Mon, 2011-12-05 at 18:22 +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.

This looks like a proper fix. Move this to the front of the patch set,
as this and patch 1 can go into ftrace now as fixes.

-- Steve

> 
> Signed-off-by: Jiri Olsa <jolsa@...hat.com>


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