netdev - Re: [PATCH 40/45] powerpc, irq: Use GFP_ATOMIC allocations in atomic context

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Message-ID: <1372130007.3944.185.camel@pasglop>
Date:	Tue, 25 Jun 2013 13:13:27 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, akpm@...ux-foundation.org, namhyung@...nel.org,
	walken@...gle.com, vincent.guittot@...aro.org,
	laijs@...fujitsu.com, rostedt@...dmis.org,
	wangyun@...ux.vnet.ibm.com, xiaoguangrong@...ux.vnet.ibm.com,
	sbw@....edu, fweisbec@...il.com, zhong@...ux.vnet.ibm.com,
	nikunj@...ux.vnet.ibm.com, linux-pm@...r.kernel.org,
	linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>,
	Ian Munsie <imunsie@....ibm.com>
Subject: Re: [PATCH 40/45] powerpc, irq: Use GFP_ATOMIC allocations in
 atomic context

On Tue, 2013-06-25 at 12:58 +1000, Michael Ellerman wrote:
> On Tue, Jun 25, 2013 at 12:13:04PM +1000, Benjamin Herrenschmidt wrote:
> > On Tue, 2013-06-25 at 12:08 +1000, Michael Ellerman wrote:
> > > We're not checking for allocation failure, which we should be.
> > > 
> > > But this code is only used on powermac and 85xx, so it should probably
> > > just be a TODO to fix this up to handle the failure.
> > 
> > And what can we do if they fail ?
> 
> Fail up the chain and not unplug the CPU presumably.

BTW. Isn't Srivatsa series removing the need to stop_machine() for
unplug ? That should mean we should be able to use GFP_KERNEL no ?

Cheers,
Ben.


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