uprobes: Kill uprobe_consumer->filter()

uprobe_consumer->filter() is pointless in its current form, kill it.

We will add it back, but with the different signature/semantics. Perhaps
we will even re-introduce the callsite in handler_chain(), but not to
just skip uc->handler().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>

3 files changed, 2 insertions, 10 deletions

diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 4f628a6fc5b4..83742b91ff73 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -37,11 +37,6 @@ struct inode;
 
 struct uprobe_consumer {
         int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
-        /*
-         * filter is optional; If a filter exists, handler is run
-         * if and only if filter returns true.
-         */
-        bool (*filter)(struct uprobe_consumer *self, struct task_struct *task);
 
         struct uprobe_consumer *next;
 };
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index a39d8163b713..5cbebac27c01 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -477,10 +477,8 @@ static void handler_chain(struct uprobe *uprobe, struct pt_regs *regs)
                 return;
 
         down_read(&uprobe->consumer_rwsem);
-        for (uc = uprobe->consumers; uc; uc = uc->next) {
-                if (!uc->filter || uc->filter(uc, current))
-                        uc->handler(uc, regs);
-        }
+        for (uc = uprobe->consumers; uc; uc = uc->next)
+                uc->handler(uc, regs);
         up_read(&uprobe->consumer_rwsem);
 }
 
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 87b6db4ccbc5..e668024773d4 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -550,7 +550,6 @@ static int probe_event_enable(struct trace_uprobe *tu, int flag)
                 return -EINTR;
 
         utc->cons.handler = uprobe_dispatcher;
-        utc->cons.filter = NULL;
         ret = uprobe_register(tu->inode, tu->offset, &utc->cons);
         if (ret) {
                 kfree(utc);