linux-kernel - [PATCH 2/4] uprobes: Change filter_chain() to iterate ->consumers list

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Date:	Sat, 24 Nov 2012 19:02:31 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] uprobes: Change filter_chain() to iterate ->consumers
	list

Now that it safe to use ->consumer_rwsem under ->mmap_sem we can
almost finish the implementation of filter_chain(). It still lacks
the actual uc->filter(...) call but othewrwise it is ready, just
it pretends that ->filter() always returns true.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/events/uprobes.c |   21 +++++++++++++--------
 1 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 03ffbb5..873c993 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -614,14 +614,19 @@ static int prepare_uprobe(struct uprobe *uprobe, struct file *file,
 
 static bool filter_chain(struct uprobe *uprobe)
 {
-	/*
-	 * TODO:
-	 *	for_each_consumer(uc)
-	 *		if (uc->filter(...))
-	 *			return true;
-	 *	return false;
-	 */
-	return uprobe->consumers != NULL;
+	struct uprobe_consumer *uc;
+	bool ret = false;
+
+	down_read(&uprobe->consumer_rwsem);
+	for (uc = uprobe->consumers; uc; uc = uc->next) {
+		/* TODO: ret = uc->filter(...) */
+		ret = true;
+		if (ret)
+			break;
+	}
+	up_read(&uprobe->consumer_rwsem);
+
+	return ret;
 }
 
 static int
-- 
1.5.5.1

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