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Message-Id: <20080731.054401.06991829.davem@davemloft.net>
Date:	Thu, 31 Jul 2008 05:44:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	nickpiggin@...oo.com.au
Cc:	jarkao2@...il.com, johannes@...solutions.net, netdev@...eo.de,
	peterz@...radead.org, 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, mingo@...hat.com
Subject: Re: Kernel WARNING: at net/core/dev.c:1330
 __netif_schedule+0x2c/0x98()

From: Nick Piggin <nickpiggin@...oo.com.au>
Date: Thu, 31 Jul 2008 22:38:19 +1000

> Except for the braindead volatile that gets stuck on the bitops pointer.
> 
> Last time I complained about this, a lot of noise was made and I think
> Linus wanted it to stay around so we could pass volatile pointers to
> bitops & co without warnings. I say we should just remove the volatile
> and kill any callers that might warn...

Ho hum... :)

Another way to approach that, and keep the volatile, is to have
a "test_flags()" interface that takes the bit mask of values
you want to test for cases where you know it is a single word
flags value.

The downside is that this kind of interface is easy to use
incorrectly especially when accesses to the same flags use
bot test_bit() and test_flags().
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