tracepoint: Simplify tracepoint module search

Instead of copying the num_tracepoints and tracepoints_ptrs from
the module structure to the tp_mod structure, which only uses it to
find the module associated to tracepoints of modules that are coming
and going, simply copy the pointer to the module struct to the tracepoint
tp_module structure.

Also removed un-needed brackets around an if statement.

Link: http://lkml.kernel.org/r/20140408201705.4dad2c4a@gandalf.local.home
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 08150e2..69a298b 100644 (file)
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -47,8 +47,7 @@ for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv),
 #ifdef CONFIG_MODULES
 struct tp_module {
        struct list_head list;
-       unsigned int num_tracepoints;
-       struct tracepoint * const *tracepoints_ptrs;
+       struct module *mod;
 };
 
 bool trace_module_has_bad_taint(struct module *mod);

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index 01b3bd8..162be19 100644 (file)
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -374,8 +374,7 @@ static int tracepoint_module_coming(struct module *mod)
                ret = -ENOMEM;
                goto end;
        }
-       tp_mod->num_tracepoints = mod->num_tracepoints;
-       tp_mod->tracepoints_ptrs = mod->tracepoints_ptrs;
+       tp_mod->mod = mod;
        list_add_tail(&tp_mod->list, &tracepoint_module_list);
        blocking_notifier_call_chain(&tracepoint_notify_list,
                        MODULE_STATE_COMING, tp_mod);
@@ -393,7 +392,7 @@ static void tracepoint_module_going(struct module *mod)
 
        mutex_lock(&tracepoint_module_list_mutex);
        list_for_each_entry(tp_mod, &tracepoint_module_list, list) {
-               if (tp_mod->tracepoints_ptrs == mod->tracepoints_ptrs) {
+               if (tp_mod->mod == mod) {
                        blocking_notifier_call_chain(&tracepoint_notify_list,
                                        MODULE_STATE_GOING, tp_mod);
                        list_del(&tp_mod->list);
@@ -447,9 +446,9 @@ static __init int init_tracepoints(void)
        int ret;
 
        ret = register_module_notifier(&tracepoint_module_nb);
-       if (ret) {
+       if (ret)
                pr_warning("Failed to register tracepoint module enter notifier\n");
-       }
+
        return ret;
 }
 __initcall(init_tracepoints);