linux-kernel - Re: [rfc 01/45] ACPI: Avoid references to impossible processors.

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Message-ID: <Pine.LNX.4.64.0711201214540.26419@schroedinger.engr.sgi.com>
Date:	Tue, 20 Nov 2007 12:16:40 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
cc:	ak@...e.de, akpm@...ux-foundation.org, travis@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc 01/45] ACPI: Avoid references to impossible processors.

On Tue, 20 Nov 2007, Mathieu Desnoyers wrote:

> > Convert one loop to NR_CPUS to use the cpu_possible map instead.
> > 
> 
> I'm just wondering how broken this is. Is there any assumption that
> there is no holes in the online cpu map in this code ?

Yeah, I saw only one loop in there and so I think this covers it. The 
debug code that I added to the cpu alloc patches did not throw any warning 
and bugs anymore. So I am sure that this does not occur on the 
configurations where I tested it. If some is running with the latest cpu 
area patches then he will get bugs() for accessing an impossible 
processors cpu area and warnings for accessing an offline processors cpu 
area.

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