linux-kernel - Re: [PATCH 1/2] kernel/trace: call helper function to check global

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Date:	Tue, 22 Sep 2015 09:58:47 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Yaowei Bai <bywxiaobai@....com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] kernel/trace: call helper function to check
 global_trace

On Tue, 22 Sep 2015 21:43:12 +0800
Yaowei Bai <bywxiaobai@....com> wrote:

> Use helper function tracing_is_enabled() to check if global_trace
> has been disabled.

Actually, I prefer not to.

> 
> No functional change.
> 
> Signed-off-by: Yaowei Bai <bywxiaobai@....com>
> ---
>  kernel/trace/trace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index 6e79408..b0bd322a 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -7111,7 +7111,7 @@ __init static int tracer_alloc_buffers(void)
>  		goto out_free_savedcmd;
>  	}
>  
> -	if (global_trace.buffer_disabled)
> +	if (!tracing_is_enabled())

Yes, the above is functionally equivalent. But tracing_is_enabled() is
not a "helper function" but actually an external interface for other
parts of the tracing system.

The above code is the actual setup of the tracing infrastructure, that
is used to allocate the tracing buffers. They may now use the same
logic, but there's no guarantee that it will in the future.

-- Steve


>  		tracing_off();
>  
>  	if (trace_boot_clock) {

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