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SubjectRe: [GIT PULL] RCU changes for v3.3
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Le mardi 24 janvier 2012 à 08:53 -0800, Paul E. McKenney a écrit :
> On Tue, Jan 24, 2012 at 05:25:12PM +0100, Eric Dumazet wrote:
> > Le jeudi 05 janvier 2012 à 14:54 +0100, Ingo Molnar a écrit :
> > > Linus,
> > >
> > > Please pull the latest core-rcu-for-linus git tree from:
> > >
> > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-rcu-for-linus
> > >
> > > Thanks,
> >
> > Hi guys
> >
> > New lockdep warning here :
>
> Hmmm... Looks like tracing from within the inner idle loop.
>
> Because RCU ignores CPUs in the inner idle loop (after the call to
> rcu_idle_enter()), RCU read-side critical sections are not legal there.
>
> One approach would be to delay the call to rcu_idle_enter() until after
> the tracing is done, and to ensure that the call to rcu_idle_exit() happens
> before any tracing. I am not seeing perf_trace_power(), so need to
> update and look again. Or are you looking at -next rather than mainline?
>

I am using mainline, not -next

It seems "powertop" triggers the warnings.

Check include/trace/events/power.h line 75 :

DECLARE_EVENT_CLASS(power,

This declares perf_trace_power()...

include/trace/ftrace.h line 718

#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
static notrace void \
perf_trace_##call(void *__data, proto) ...


Thanks


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