Re: LOCKDEP warning due to ext_devt_lock

[Jens Axboe]

On 05/27/2015 08:32 PM, NeilBrown wrote:
> Hi Keith,
>   I'm getting lockdep warning around use of ext_devt_lock.
>
> [11428.266019] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
>
>   As you say in
>      2da78092dda1 ("block: Fix dev_t minor allocation lifetime")
> ext_devt_lock can be taken from call_rcu's soft-irq.
> I think that means it should always use the _irq verion of spinlock.

Wouldn't spin_lock_bh() and friends suffice then?

--
Jens Axboe

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