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x86, ftrace: fix section mismatch in hw-branch-tracer

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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>
This commit is contained in:
Markus Metzger 2009-02-24 13:55:18 +01:00 committed by Ingo Molnar
parent a7f4463e03
commit 5e01cb695d
1 changed files with 3 additions and 4 deletions
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7
kernel/trace/trace_hw_branches.c
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@ -127,20 +127,18 @@ static struct notifier_block bts_hotcpu_notifier __cpuinitdata = {
.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 @@ struct tracer bts_tracer __read_mostly =
__init static int init_bts_trace(void)
{
register_hotcpu_notifier(&bts_hotcpu_notifier);
return register_tracer(&bts_tracer);
}
device_initcall(init_bts_trace);