diff options
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace_syscalls.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index c72e599230f..c5fc1d8880f 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -96,8 +96,9 @@ void start_ftrace_syscalls(void) unsigned long flags; struct task_struct *g, *t; + /* Don't enable the flag on the tasks twice */ if (atomic_inc_return(&refcount) != 1) - goto out; + return; arch_init_ftrace_syscalls(); read_lock_irqsave(&tasklist_lock, flags); @@ -107,8 +108,6 @@ void start_ftrace_syscalls(void) } while_each_thread(g, t); read_unlock_irqrestore(&tasklist_lock, flags); -out: - atomic_dec(&refcount); } void stop_ftrace_syscalls(void) @@ -116,8 +115,9 @@ void stop_ftrace_syscalls(void) unsigned long flags; struct task_struct *g, *t; + /* There are perhaps still some users */ if (atomic_dec_return(&refcount)) - goto out; + return; read_lock_irqsave(&tasklist_lock, flags); @@ -126,8 +126,6 @@ void stop_ftrace_syscalls(void) } while_each_thread(g, t); read_unlock_irqrestore(&tasklist_lock, flags); -out: - atomic_inc(&refcount); } void ftrace_syscall_enter(struct pt_regs *regs) @@ -201,6 +199,7 @@ static int init_syscall_tracer(struct trace_array *tr) static void reset_syscall_tracer(struct trace_array *tr) { stop_ftrace_syscalls(); + tracing_reset_online_cpus(tr); } static struct trace_event syscall_enter_event = { |