uprobes/tracing: Introduce uprobe_{trace,perf}_print() helpers

Extract the output code from uprobe_trace_func() and uprobe_perf_func()
into the new helpers, they will be used by ->ret_handler() too. We also
add the unused "unsigned long func" argument in advance, to simplify the
next changes.

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

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 49b4003..0c0f0a7 100644 (file)
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -497,8 +497,8 @@ static const struct file_operations uprobe_profile_ops = {
        .release        = seq_release,
 };
 
-/* uprobe handler */
-static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
+static void uprobe_trace_print(struct trace_uprobe *tu,
+                               unsigned long func, struct pt_regs *regs)
 {
        struct uprobe_trace_entry_head *entry;
        struct ring_buffer_event *event;
@@ -511,7 +511,7 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
        event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
                                                  size, 0, 0);
        if (!event)
-               return 0;
+               return;
 
        entry = ring_buffer_event_data(event);
        entry->vaddr[0] = instruction_pointer(regs);
@@ -521,7 +521,12 @@ static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
 
        if (!filter_current_check_discard(buffer, call, entry, event))
                trace_buffer_unlock_commit(buffer, event, 0, 0);
+}
 
+/* uprobe handler */
+static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
+{
+       uprobe_trace_print(tu, 0, regs);
        return 0;
 }
 
@@ -754,8 +759,8 @@ static bool uprobe_perf_filter(struct uprobe_consumer *uc,
        return ret;
 }
 
-/* uprobe profile handler */
-static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
+static void uprobe_perf_print(struct trace_uprobe *tu,
+                               unsigned long func, struct pt_regs *regs)
 {
        struct ftrace_event_call *call = &tu->call;
        struct uprobe_trace_entry_head *entry;
@@ -764,13 +769,10 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
        void *data;
        int size, rctx, i;
 
-       if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
-               return UPROBE_HANDLER_REMOVE;
-
        size = SIZEOF_TRACE_ENTRY(false);
        size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
        if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
-               return 0;
+               return;
 
        preempt_disable();
        entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
@@ -787,6 +789,15 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
        perf_trace_buf_submit(entry, size, rctx, ip, 1, regs, head, NULL);
  out:
        preempt_enable();
+}
+
+/* uprobe profile handler */
+static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
+{
+       if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
+               return UPROBE_HANDLER_REMOVE;
+
+       uprobe_perf_print(tu, 0, regs);
        return 0;
 }
 #endif /* CONFIG_PERF_EVENTS */