linux-kernel - Re: [PATCH v2 2/2] ftrace: Unify effect of writing to trace

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Date:	Sat, 8 Aug 2009 02:39:30 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Zhaolei <zhaolei@...fujitsu.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] ftrace: Unify effect of writing to
	trace_options and option/*

On Fri, Aug 07, 2009 at 06:55:48PM +0800, Zhaolei wrote:
> "echo noglobal-clock > trace_options" can be used to change trace
> clock but "echo 0 > options/global-clock" can't.
> 
> We can fix it by using set_tracer_flags() in trace_options_core_write().
> 
> Changelog:
> v1->v2: Simplied switch() by Li Zefan <lizf@...fujitsu.com>'s suggest.
> 
> Signed-off-by: Zhao Lei <zhaolei@...fujitsu.com>


Queued for .31, thanks!

> ---
>  kernel/trace/trace.c |   12 ++----------
>  1 files changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 6c5f67f..06a2dfa 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -3718,17 +3718,9 @@ trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt,
>  	if (ret < 0)
>  		return ret;
>  
> -	switch (val) {
> -	case 0:
> -		trace_flags &= ~(1 << index);
> -		break;
> -	case 1:
> -		trace_flags |= 1 << index;
> -		break;
> -
> -	default:
> +	if (val != 0 && val != 1)
>  		return -EINVAL;
> -	}
> +	set_tracer_flags(1 << index, val);
>  
>  	*ppos += cnt;
>  
> -- 
> 1.5.5.3
> 
> 

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