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Re: [PATCH v2 2.6.38-rc8-tip 17/20] 17: uprobes: filter chain
- From: Stephen Wilson <wilsons at start dot ca>
- To: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- Cc: Peter Zijlstra <peterz at infradead dot org>, Ingo Molnar <mingo at elte dot hu>, Steven Rostedt <rostedt at goodmis dot org>, Linux-mm <linux-mm at kvack dot org>, Arnaldo Carvalho de Melo <acme at infradead dot org>, Linus Torvalds <torvalds at linux-foundation dot org>, Christoph Hellwig <hch at infradead dot org>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Oleg Nesterov <oleg at redhat dot com>, LKML <linux-kernel at vger dot kernel dot org>, SystemTap <systemtap at sources dot redhat dot com>, Jim Keniston <jkenisto at linux dot vnet dot ibm dot com>, Roland McGrath <roland at hack dot frob dot com>, Andi Kleen <andi at firstfloor dot org>, Andrew Morton <akpm at linux-foundation dot org>, "Paul E. McKenney" <paulmck at linux dot vnet dot ibm dot com>
- Date: Tue, 15 Mar 2011 15:49:14 -0400
- Subject: Re: [PATCH v2 2.6.38-rc8-tip 17/20] 17: uprobes: filter chain
- References: <20110314133403.27435.7901.sendpatchset@localhost6.localdomain6> <20110314133722.27435.55663.sendpatchset@localhost6.localdomain6>
On Mon, Mar 14, 2011 at 07:07:22PM +0530, Srikar Dronamraju wrote:
>
> Loops through the filters callbacks of currently registered
> consumers to see if any consumer is interested in tracing this task.
Should this be part of the series? It is not currently used.
> /* Acquires 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)) {
The implementation does not seem to match the changelog description.
Should this not be:
if (consumer->filter && consumer->filter(consumer, t))
?
> + ret = true;
> + break;
> + }
> + }
> + up_read(&uprobe->consumer_rwsem);
> + return ret;
> +}
> +
--
steve