Date: Mon, 20 Aug 2007 22:08:47 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Satyam Sharma <satyam@infradead.org>, Sam Ravnborg <sam@ravnborg.org>,
       Randy Dunlap <randy.dunlap@oracle.com>, wbrana@gmail.com,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][bugzilla #8679] therm_throt.c: Fix section mismatch
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	<20070820220328.438e8a4d.akpm@linux-foundation.org>
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On Mon, 20 Aug 2007 22:03:28 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:

> register_hotcpu_notifier() is cunning.  If CONFIG_HOTPLUG_CPU=y, we need
> the notifier block and the function to which it points to be in .data and
> in .text.  If CONFIG_HOTPLUG_CPU=n, we don't need them to be present at all.
> 
> So what we can do is to just leave the notifier block in .data and the
> function in .text and then the compiler/linker will notice that nothing
> references them and they will be omitted at build time.

As long as the notifier block and the function are static.  I don't think
the toolchain is smart enough to remove them if they have global scope,
but I didn't check this..
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