linux-kernel - Re: [tip:x86/urgent] x86-32: Restore irq stacks NUMA-aware allocations

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Message-ID: <20101029200859.GA6130@lenovo>
Date:	Sat, 30 Oct 2010 00:09:00 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	eric.dumazet@...il.com, brgerst@...il.com, tglx@...utronix.de,
	mingo@...e.hu, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86-32: Restore irq stacks NUMA-aware
	allocations

On Fri, Oct 29, 2010 at 08:32:26PM +0200, Peter Zijlstra wrote:
> On Fri, 2010-10-29 at 06:43 +0000, tip-bot for Eric Dumazet wrote:
> > +       irqctx = page_address(alloc_pages_node(cpu_to_node(cpu),
> > +                                              THREAD_FLAGS,
> > +                                              THREAD_ORDER)); 
> 
> Shouldn't we be checking for a NULL return from alloc_pages_node()
> before calling page_address() on it?

 It seems at this stage it's a panic() or BUG_ON candidate. (Which
reminds me GFP_PANIC flag proposal back in 2009 ;)

  Cyrill
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