linux-kernel - Re: [patch 0/6] cpumask_of_node() should handle -1 as a node

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Message-ID: <20100112010721.GC12666@kryten>
Date:	Tue, 12 Jan 2010 12:07:21 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [patch 0/6] cpumask_of_node() should handle -1 as a node

Hi Andrew,

> > A number of places in the kernel use cpumask_of_node(-1), but most arch
> > NUMA implementations are broken. The following patches fix this.
> 
> So..  what's happening here?  Nobody has applied the patches anywhere,
> you later said "the scheduler oopses in a number of places with
> CPUMASK_OFFSTACK and sparse node ids" and mention of a -stable backport
> was mentioned.

That scheduler issue doesn't appear in mainline as no one is allocating sparse
node IDs yet.

There is still the opportunity for an Oops with CPUMASK_OFFSTACK and
/sys/.../local_cpus and even with CPUMASK_OFFSTACK disabled it will return
random data.

Ralph has picked up the mips bit, Ben is sucking in the powerpc bit.
Davem has acked the sparc bit. I'll roll up a -stable patch once they
hit.

No answer from alpha and ia64.

Anton
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