linux-kernel - Re: [PATCH 1/2] jump label: make enable/disable o(1)

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Message-ID: <1294248665.26623.30.camel@gandalf.stny.rr.com>
Date:	Wed, 05 Jan 2011 12:31:05 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	peterz@...radead.org, mathieu.desnoyers@...ymtl.ca, hpa@...or.com,
	mingo@...e.hu, tglx@...utronix.de, andi@...stfloor.org,
	roland@...hat.com, rth@...hat.com, masami.hiramatsu.pt@...achi.com,
	fweisbec@...il.com, avi@...hat.com, davem@...emloft.net,
	sam@...nborg.org, ddaney@...iumnetworks.com,
	michael@...erman.id.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] jump label: make enable/disable o(1)

On Wed, 2011-01-05 at 10:43 -0500, Jason Baron wrote:
>  
> +struct jump_label_key {
> +	int state;
> +};
> +
>  #define JUMP_LABEL(key, label)			\
>  do {						\
> -	if (unlikely(*key))			\
> +	if (unlikely(((struct jump_label_key *)key)->state))		\
>  		goto label;			\
>  } while (0)

Anything that uses JUMP_LABEL() should pass in a pointer to a struct
jump_label_key. Hence, remove the typecast. That can only lead to hard
to find bugs.

-- Steve


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