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Date: Mon, 23 Feb 2009 01:15:08 +0900 (JST)
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH -mm] tracing: Fix section mismatch in trace_hw_branches.c
Cc: kosaki.motohiro@jp.fujitsu.com, Rakib Mullick <rakib.mullick@gmail.com>,
       Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, markus.t.metzger@gmail.com
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> When I saw this patch, I searched the real purpose of __cpuinit and its
> real impact.
> But I didn't find any comments about it inside the kernel.

AFAIK, __cpuinit mean

if UP,                     __cpuinit == __init
if SMP=Y && HOTPLUG_CPU=y, __cpuinit == "" (do nothing)
if SMP=Y && HOTPLUG_CPU=n, __cpuinit == __init