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Subject[RFC] [PATCH 2.6.37-rc5-tip 17/20] 17: uprobes: filter chain

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@linux.vnet.ibm.com>
---
kernel/uprobes.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index 93a3118..b0d323c 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -429,6 +429,24 @@ static void handler_chain(struct uprobe *uprobe, struct pt_regs *regs)
}

/* 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)) {
+ ret = true;
+ break;
+ }
+ }
+ up_read(&uprobe->consumer_rwsem);
+ return ret;
+}
+
+/* Acquires uprobe->consumer_rwsem */
static void add_consumer(struct uprobe *uprobe,
struct uprobe_consumer *consumer)
{

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