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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH v3 2/4] net: Allow for more then a single subclass for
 netif_addr_lock
Date: Wed, 04 Jun 2014 14:53:44 -0700 (PDT)
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From: "Keller, Jacob E" <jacob.e.keller@intel.com>
Date: Wed, 4 Jun 2014 21:42:12 +0000

> This only occurs if CONFIG_DEBUG_LOCK_ALLOC=Y, and there seems to be no
> easy fix for the warning, due to how spin_lock_nested is a macro that
> discards the second parameter when DEBUG_LOCK_ALLOC is disabled.

spin_lock_nested(), in that case, should mark the argument as unused.