Re: [LOCKDEP BUG][2.6.36-rc1] xt_info_wrlock?

[David Miller]

From: Steven Rostedt <rostedt@xxxxxxxxxxx>
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.

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