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由 Oleg Nesterov 提交于
perf_trace_buf_prepare() + perf_trace_buf_submit(head, task => NULL) make no sense if hlist_empty(head). Change perf_syscall_enter/exit() to check sys_data->{enter,exit}_event->perf_events beforehand. Link: http://lkml.kernel.org/r/20130617170207.GA19806@redhat.comAcked-by: NPeter Zijlstra <peterz@infradead.org> Signed-off-by: NOleg Nesterov <oleg@redhat.com> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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