linux-kernel - Re: blkiocg_update_io_add_stats(): INFO: trying to register non-static key

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Date:	Wed, 2 Jun 2010 15:04:56 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>, piotr@...owicz.com,
	linux-kernel@...r.kernel.org, Divyesh Shah <dpshah@...gle.com>
Subject: Re: blkiocg_update_io_add_stats(): INFO: trying to register
	non-static  key

On Wed, Jun 02 2010, Ingo Molnar wrote:
> 
> btw., there's another warning triggered by the new blk-cgroups stats code:
> 
> sda:INFO: trying to register non-static key.
> the code is fine but needs lockdep annotation.
> turning off the locking correctness validator.
> Pid: 81, comm: async/2 Not tainted 2.6.35-rc1-tip-01073-gd2f7698-dirty #6765
> Call Trace:
>  [<ffffffff81065d6d>] register_lock_class+0x15f/0x365
>  [<ffffffff8105c426>] ? sched_clock_local+0x1d/0x83
>  [<ffffffff8105c557>] ? sched_clock_cpu+0xcb/0xd9
>  [<ffffffff81067184>] __lock_acquire+0x97/0x481
>  [<ffffffff810088d4>] ? native_sched_clock+0x37/0x6d
>  [<ffffffff81321b74>] ? blkiocg_update_io_add_stats+0x32/0x12e
>  [<ffffffff81067644>] lock_acquire+0xd6/0xfd
>  [<ffffffff81321b74>] ? blkiocg_update_io_add_stats+0x32/0x12e
>  [<ffffffff81850859>] _raw_spin_lock_irqsave+0x47/0x82
>  [<ffffffff81321b74>] ? blkiocg_update_io_add_stats+0x32/0x12e
>  [<ffffffff81321b74>] blkiocg_update_io_add_stats+0x32/0x12e

So that's blkg->stats_lock - help me out, what is lockdep complaining
about? The lock is initialized, what kind of lockdep annotation magic do
we need to sprinkle on it?

-- 
Jens Axboe

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