netdev - Re: Kernel WARNING: at net/core/dev.c:1330 __netif

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Message-Id: <20080723.005921.113868915.davem@davemloft.net>
Date:	Wed, 23 Jul 2008 00:59:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	Larry.Finger@...inger.net, kaber@...sh.net,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: Kernel WARNING: at net/core/dev.c:1330
 __netif_schedule+0x2c/0x98()

From: Jarek Poplawski <jarkao2@...il.com>
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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