linux-kernel - Re: [PATCH v2 11/11] lockdep,trace: Expose tracepoints

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Date:   Thu, 3 Sep 2020 11:11:49 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org, will@...nel.org,
        npiggin@...il.com, elver@...gle.com, jgross@...e.com,
        paulmck@...nel.org, rostedt@...dmis.org, rjw@...ysocki.net,
        joel@...lfernandes.org, svens@...ux.ibm.com, tglx@...utronix.de,
        ulf.hansson@...aro.org, viresh.kumar@...aro.org,
        vincent.guittot@...aro.org
Subject: Re: [PATCH v2 11/11] lockdep,trace: Expose tracepoints

On 9/3/20 8:36 AM, peterz@...radead.org wrote:
> On Thu, Sep 03, 2020 at 08:19:38AM -0700, Guenter Roeck wrote:
>> This doesn't compile for me - there is no "name" parameter in __DO_TRACE().
>>
>> Error log:
>> In file included from ./include/linux/rculist.h:11,
>>                  from ./include/linux/pid.h:5,
>>                  from ./include/linux/sched.h:14,
>>                  from ./include/linux/sched/numa_balancing.h:10,
>>                  from ./include/trace/events/sched.h:8,
>>                  from kernel/sched/core.c:10:
>> ./include/trace/events/sched.h: In function 'trace_sched_kthread_stop':
>> ./include/linux/tracepoint.h:175:26: error: '__tracepoint_name' undeclared
>>
>> I applied your patch on top of v5.9-rc3-75-gfc3abb53250a. Are you using
>> a different branch ?
> 
> Argh, I was on tip/master... easy fix though.

That version silences the tracebacks on arm. I can't test on real hardware,
so I don't know if it also fixes the problem reported at [1] (which seems
related).

Guenter

---
[1] https://lore.kernel.org/lkml/CA+G9fYuiJwN1ad955Xw4ShamX2=373r+56KsbpeverEs+i_NAg@mail.gmail.com/t/#u