linux-kernel - RCU: how to suppress warnings from rcu_assign

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Message-ID: <20110729105058.2cb9fa86@nehalam.ftrdhcpuser.net>
Date:	Fri, 29 Jul 2011 10:50:58 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Michael Chan <mchan@...adcom.com>, linux-kernel@...r.kernel.org
Subject: RCU: how to suppress warnings from rcu_assign_pointer?

Gcc now generates warnings from rcu_assign_pointer when passed the
address of something for example:
	rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
This warning is harmless and should be surpressed but there maybe
other cases where we want that Gcc warning.

I tried various combinations of in rcu_assign_pointer macro
  #pragma GCC diagnostic push
  #pragma GCC diagnostic ignored "-Wlogical-op"
  ...
  #pragma GCC diagnostic pop
but macro's and pragma's don't nest with the correct scope for
this.

Maybe some one with more Gcc foo and time to waste could take
a crack at it.

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