x86, ftrace: fix section mismatch in hw-branch-tracer
Fix an invalid memory reference problem when cpu hotplug support is
disabled and the hw-branch-tracer is set as current tracer.
Initializing the tracer calls bts_trace_init() which has already
been freed at this time.
Reported-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index 3561aac..3335e80 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -127,20 +127,18 @@
.notifier_call = bts_hotcpu_handler
};
-static int __cpuinit bts_trace_init(struct trace_array *tr)
+static int bts_trace_init(struct trace_array *tr)
{
hw_branch_trace = tr;
- register_hotcpu_notifier(&bts_hotcpu_notifier);
bts_trace_start(tr);
return 0;
}
-static void __cpuinit bts_trace_reset(struct trace_array *tr)
+static void bts_trace_reset(struct trace_array *tr)
{
bts_trace_stop(tr);
- unregister_hotcpu_notifier(&bts_hotcpu_notifier);
}
static void bts_trace_print_header(struct seq_file *m)
@@ -299,6 +297,7 @@
__init static int init_bts_trace(void)
{
+ register_hotcpu_notifier(&bts_hotcpu_notifier);
return register_tracer(&bts_tracer);
}
device_initcall(init_bts_trace);
