linux-kernel - Re: [PATCH v5 3.1.0-rc4-tip 2/26] Uprobes: Allow multiple consumers for an uprobe.

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Date:	Mon, 26 Sep 2011 14:29:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3.1.0-rc4-tip 2/26]   Uprobes: Allow multiple
 consumers for an uprobe.

On Tue, 2011-09-20 at 17:30 +0530, Srikar Dronamraju wrote:
> +       con = uprobe->consumers;
> +       if (consumer == con) {
> +               uprobe->consumers = con->next;
> +               ret = true;
> +       } else {
> +               for (; con; con = con->next) {
> +                       if (con->next == consumer) {
> +                               con->next = consumer->next;
> +                               ret = true;
> +                               break;
> +                       }
> +               }
> +       } 

	struct uprobe_consumer **next = &uprobe->consumers;

	for (; *next; next = &(*next)->next) {
		if (*next == consumer) {
			*next = (*next)->next;
			ret = true;
			break;
		}
	}

Wouldn't something like that work?
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