From: David Miller <davem@davemloft.net>
To: rostedt@goodmis.org
Cc: eric.dumazet@gmail.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kaber@trash.net, mingo@elte.hu,
peterz@infradead.org
Subject: Re: [LOCKDEP BUG][2.6.36-rc1] xt_info_wrlock?
Date: Mon, 16 Aug 2010 12:44:00 -0700 (PDT) [thread overview]
Message-ID: <20100816.124400.42792595.davem@davemloft.net> (raw)
In-Reply-To: <1281981301.3268.110.camel@gandalf.stny.rr.com>
From: Steven Rostedt <rostedt@goodmis.org>
Date: Mon, 16 Aug 2010 13:55:01 -0400
> Please tell me what prevents an interrupt going off after we grab the
> xt_info_wrlock(cpu) in get_counters().
He's only accessing the per-cpu counter locks of other cpus.
The per-cpu lock is only locally accessed by a cpu in software
interrupt context.
That is why his transformation is legal.
Lockdep simply hasn't been informed of this invariant and has
to assume the worst.
next prev parent reply other threads:[~2010-08-16 19:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-16 17:07 [LOCKDEP BUG][2.6.36-rc1] xt_info_wrlock? Steven Rostedt
2010-08-16 17:31 ` Eric Dumazet
2010-08-16 17:55 ` Steven Rostedt
2010-08-16 18:16 ` Steven Rostedt
2010-08-16 18:36 ` Peter Zijlstra
2010-08-16 18:48 ` Eric Dumazet
2010-08-16 19:16 ` Peter Zijlstra
2010-08-16 19:35 ` Eric Dumazet
2010-08-16 20:01 ` Peter Zijlstra
2010-08-16 20:17 ` Eric Dumazet
2010-08-16 18:48 ` Eric Dumazet
2010-08-16 19:44 ` David Miller [this message]
2010-08-16 20:04 ` Peter Zijlstra
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