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ftrace: Consistently restore trace function on sysctl enabling 

If we reenable ftrace via syctl, we currently set ftrace_trace_function
based on the previous simplistic algorithm. This is inconsistent with
what update_ftrace_function does. So better call that helper instead.

Link: http://lkml.kernel.org/r/5151D26F.1070702@siemens.com

Cc: stable@vger.kernel.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jan Kiszka 2013-03-26 17:53:03 +01:00 committed by Steven Rostedt
parent 2930e04d00
commit 5000c41884
1 changed files with 2 additions and 6 deletions
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8
kernel/trace/ftrace.c
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@ -4555,12 +4555,8 @@ ftrace_enable_sysctl(struct ctl_table *table, int write,
ftrace_startup_sysctl();
/* we are starting ftrace again */
if (ftrace_ops_list != &ftrace_list_end) {
if (ftrace_ops_list->next == &ftrace_list_end)
ftrace_trace_function = ftrace_ops_list->func;
else
ftrace_trace_function = ftrace_ops_list_func;
}
if (ftrace_ops_list != &ftrace_list_end)
update_ftrace_function();
} else {
/* stopping ftrace calls (just send to ftrace_stub) */