Hi Steven, On Thu, Jul 6, 2017 at 5:59 AM, Steven Rostedt <[email protected]> wrote: [..] >> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c >> index b66a1c8805f3..27b981a46389 100644 >> --- a/kernel/trace/trace.c >> +++ b/kernel/trace/trace.c >> @@ -1918,7 +1918,11 @@ static int trace_save_cmdline(struct task_struct *tsk) >> { >> unsigned pid, idx; >> >> - if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) >> + /* treat recording of idle task as a success */ >> + if (!tsk->pid) >> + return 1; >> + >> + if (unlikely(tsk->pid > PID_MAX_DEFAULT)) >> return 0; > > Make this a separate patch. This should go to stable.
Actually I am not sure if this should be marked for stable since before we were doing: tracing_record_cmdline(prev); tracing_record_cmdline(next); in probe_sched_switch, thus even if prev was the idle task, it would still goto record the next. IMO it becomes an issue only with the new stuff where we record cmdline for prev and next in the same call (tracing_record_taskinfo_sched_switch). Anyway I already broke it up into a different patch and sent it out. Let me know if anything else needs to be done here, thanks. Regards, -Joel
