linux-kernel - Re: [PATCH 04/16] x86: Replace cpu_2_logical

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Message-ID: <alpine.DEB.2.00.1101101944320.16402@chino.kir.corp.google.com>
Date:	Mon, 10 Jan 2011 19:48:41 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Tejun Heo <tj@...nel.org>
cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
	hpa@...or.com, x86@...nel.org, eric.dumazet@...il.com,
	yinghai@...nel.org, brgerst@...il.com, gorcunov@...il.com,
	penberg@...nel.org, shaohui.zheng@...el.com
Subject: Re: [PATCH 04/16] x86: Replace cpu_2_logical_apicid[] with early
 percpu variable

On Thu, 30 Dec 2010, Tejun Heo wrote:

> Unlike x86_64, on x86_32, the mapping from cpu to logical apicid may
> vary depending on apic in use.  cpu_2_logical_apicid[] array is used
> for this mapping.  Replace it with early percpu variable
> x86_cpu_to_logical_apicid to make it better aligned with other
> mappings.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

The apicid's are now stored as int's as opposed to u8, even though the max 
is 256.  Is that for extendability or for better alignment?  If not, I 
think it would be better to keep the old type.
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