linux-kernel - Re: suspicious RCU usage warnings in 3.3.0

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Message-Id: <20120413.105556.73360716787161031.davem@davemloft.net>
Date:	Fri, 13 Apr 2012 10:55:56 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	paulmck@...ux.vnet.ibm.com
Cc:	mroos@...ux.ee, shemminger@...tta.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: suspicious RCU usage warnings in 3.3.0

From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Date: Fri, 13 Apr 2012 06:35:13 -0700

DANGER WILL ROBINSON, McKenney is hacking sparc64 assembler!
:-))))

> My main concern about my patch is my removal of this line:
> 
> 	bne,pn			%icc, __handle_softirq
> 
> It is quite possible that this should instead change to look as follows:
> 
> 	bne,pn			%icc, __handle_preemption
> 

I would say it should not, because the __handle_softirq code path,
if taken, unconditionally branches to the very next instruction
after this branch and it's delay slot.

> Anyway, patch with updated changelog below.

Great work, I'll apply this after I test it out a bit myself.

Thanks a lot Paul!
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