Re: Kernel WARNING: at net/core/dev.c:1330__netif_schedule+0x2c/0x98()

[David Miller]

From: Jarek Poplawski <jarkao2@xxxxxxxxx>
Date: Wed, 23 Jul 2008 06:20:36 +0000

> PS: if there is nothing new in lockdep the classical method would
> be to change this static array:
> 
> static struct lock_class_key
> netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
> 
> to
> 
> static struct lock_class_key
> netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)][MAX_NUM_TX_QUEUES];
> 
> and set lockdep classes per queue as well. (If we are sure we don't
> need lockdep subclasses anywhere this could be optimized by using
> one lock_class_key per 8 queues and spin_lock_nested()).

Unfortunately MAX_NUM_TX_QUEUES is USHORT_MAX, so this isn't really
a feasible approach.

spin_lock_nested() isn't all that viable either, as the subclass
limit is something like 8.

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