From: Eric Dumazet <eric.dumazet@gmail.com>
To: paulmck@linux.vnet.ibm.com
Cc: "Ingo Molnar" <mingo@elte.hu>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
"Frédéric Weisbecker" <fweisbec@gmail.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: [GIT PULL] RCU changes for v3.3
Date: Tue, 24 Jan 2012 18:13:28 +0100 [thread overview]
Message-ID: <1327425208.7231.26.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> (raw)
In-Reply-To: <20120124165312.GG2531@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2012-01-24 17:13 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-05 13:54 [GIT PULL] RCU changes for v3.3 Ingo Molnar
2012-01-24 16:25 ` Eric Dumazet
2012-01-24 16:53 ` Paul E. McKenney
2012-01-24 17:04 ` Frederic Weisbecker
2012-01-24 19:09 ` Paul E. McKenney
2012-01-24 17:13 ` Eric Dumazet [this message]
2012-01-24 19:41 ` Paul E. McKenney
2012-01-24 19:57 ` Eric Dumazet
2012-01-24 21:11 ` Paul E. McKenney
2012-01-24 22:07 ` Mark Brown
2012-01-24 22:43 ` Paul E. McKenney
2012-01-24 23:51 ` Mark Brown
2012-01-25 1:36 ` Paul E. McKenney
2012-01-25 11:59 ` Mark Brown
2012-01-24 23:29 ` Paul E. McKenney
2012-01-24 23:46 ` Eric Dumazet
2012-01-24 23:54 ` Paul E. McKenney
2012-03-07 11:44 ` Sergey Senozhatsky
2012-03-07 14:09 ` Josh Boyer
2012-03-07 15:27 ` Paul E. McKenney
2012-03-07 15:49 ` Josh Boyer
2012-03-08 21:26 ` Paul E. McKenney
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