linux-kernel - Re: [PATCH v3 2.6.39-rc1-tip 26/26] 26: uprobes: filter chain

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Date:	Tue, 05 Apr 2011 10:27:04 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, 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>,
	Ananth N Mavinakayanahalli <ananth@...ibm.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>,
	SystemTap <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2.6.39-rc1-tip 26/26] 26: uprobes: filter chain

(2011/04/01 23:37), Srikar Dronamraju wrote:
> Loops through the filters callbacks of currently registered
> consumers to see if any consumer is interested in tracing this task.
> 
> Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> ---
>  kernel/uprobes.c |   17 +++++++++++++++++
>  1 files changed, 17 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/uprobes.c b/kernel/uprobes.c
> index c950f13..62ccb56 100644
> --- a/kernel/uprobes.c
> +++ b/kernel/uprobes.c
> @@ -450,6 +450,23 @@ static void handler_chain(struct uprobe *uprobe, struct pt_regs *regs)
>  	up_read(&uprobe->consumer_rwsem);
>  }
>  
> +static bool filter_chain(struct uprobe *uprobe, struct task_struct *t)
> +{
> +	struct uprobe_consumer *consumer;
> +	bool ret = false;
> +
> +	down_read(&uprobe->consumer_rwsem);
> +	for (consumer = uprobe->consumers; consumer;
> +					consumer = consumer->next) {
> +		if (!consumer->filter || consumer->filter(consumer, t)) {
> +			ret = true;
> +			break;
> +		}
> +	}
> +	up_read(&uprobe->consumer_rwsem);
> +	return ret;
> +}
> +

Where this function is called from ? This patch seems the last one of this series...

Thank you,

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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