linux-kernel - Re: [PATCH v2] trace: module: Maintain a valid user count

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Date:	Wed, 7 May 2014 12:19:06 +0200
From:	Romain Izard <romain.izard.pro@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] trace: module: Maintain a valid user count

2014-03-06 18:34 GMT+01:00 Steven Rostedt <rostedt@...dmis.org>:
> Ingo,
>
> You want to push this to Linus?
>
> Reviewed-by: Steven Rostedt <rostedt@...dmis.org>
>
> -- Steve
>
>
> On Tue,  4 Mar 2014 10:09:39 +0100
> Romain Izard <romain.izard.pro@...il.com> wrote:
>
>> The replacement of the 'count' variable by two variables 'incs' and
>> 'decs' to resolve some race conditions during module unloading was done
>> in parallel with some cleanup in the trace subsystem, and was integrated
>> as a merge.
>>
>> Unfortunately, the formula for this replacement was wrong in the tracing
>> code, and the refcount in the traces was not usable as a result.
>>
>> Use 'count = incs - decs' to compute the user count.
>>
>> Signed-off-by: Romain Izard <romain.izard.pro@...il.com>
>> ---
>>  include/trace/events/module.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/trace/events/module.h b/include/trace/events/module.h
>> index 161932737416..ca298c7157ae 100644
>> --- a/include/trace/events/module.h
>> +++ b/include/trace/events/module.h
>> @@ -78,7 +78,7 @@ DECLARE_EVENT_CLASS(module_refcnt,
>>
>>       TP_fast_assign(
>>               __entry->ip     = ip;
>> -             __entry->refcnt = __this_cpu_read(mod->refptr->incs) + __this_cpu_read(mod->refptr->decs);
>> +             __entry->refcnt = __this_cpu_read(mod->refptr->incs) - __this_cpu_read(mod->refptr->decs);
>>               __assign_str(name, mod->name);
>>       ),
>>
>

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