linux-kernel - Re: [Bugfix] sched: fix possible invalid memory access caused by CPU hot-addition

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Message-ID: <20140422200449.GF11096@twins.programming.kicks-ass.net>
Date:	Tue, 22 Apr 2014 22:04:49 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [Bugfix] sched: fix possible invalid memory access caused by CPU
 hot-addition

On Tue, Apr 22, 2014 at 01:01:51PM -0700, Andrew Morton wrote:
> On Tue, 22 Apr 2014 10:15:15 +0200 Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Tue, Apr 22, 2014 at 01:27:15PM +0800, Jiang Liu wrote:
> > > When calling kzalloc_node(size, flags, node), we should first check
> > > whether node is onlined, otherwise it may cause invalid memory access
> > > as below.
> > 
> > But this is only for memory less node crap, right? 
> 
> um, why are memoryless nodes crap?

Why wouldn't they be? Having CPUs with no local memory seems decidedly
suboptimal.
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