linux-kernel - Re: [PATCH 1/1] ftrace: do not update max buffer with no users

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Date:	Wed, 12 Nov 2008 21:47:25 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pekka Paalanen <pq@....fi>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 1/1] ftrace: do not update max buffer with no users



On Wed, 12 Nov 2008, Andrew Morton wrote:
> 
> 
> This sort of thing:
> 
> +#ifdef CONFIG_TRACER_MAX_TRACE
>  	if (current_trace && current_trace->print_max)
>  		iter->tr = &max_tr;
>  	else
> +#endif
>  		iter->tr = inode->i_private;
> 
> is particularly regrettable.

Another answer is to not allocate it and check for NULL before using it. 
But this would mean that I would have to find all the places that touch it 
(the same as the ifdefs) and make sure they are safe.

The reason I picked the ifdefs was to guarantee that there were no users 
if it was not being used.

-- Steve

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