linux-kernel - Re: 2.6.23-rc7-mm1: r/o mounts joke with lockdep

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Message-Id: <20070924092658.91c17511.akpm@linux-foundation.org>
Date:	Mon, 24 Sep 2007 09:26:58 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alexey Dobriyan <adobriyan@...ru>
Cc:	linux-kernel@...r.kernel.org, haveblue@...ibm.com
Subject: Re: 2.6.23-rc7-mm1: r/o mounts joke with lockdep

On Mon, 24 Sep 2007 13:51:05 +0400 Alexey Dobriyan <adobriyan@...ru> wrote:

> static void lock_and_coalesce_cpu_mnt_writer_counts(void)
> {
> 	int cpu;
> 	struct mnt_writer *cpu_writer;
> 
> 	for_each_possible_cpu(cpu) {
> 		cpu_writer = &per_cpu(mnt_writers, cpu);
> 		spin_lock_nested(&cpu_writer->lock, 42);
> 		                                   ^^^^
> 
> What the heck is going on?

that was some random 2:00AM hack by me to make the warnings go away.

> Given that MAX_LOCKDEP_SUBCLASSES is only 8,
> this reliably turns off lockdep at boot.

that explains why it worked so well.
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