linux-kernel - Re: Solving section mismatches

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Date:	Sun, 27 Sep 2009 20:09:53 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Solving section mismatches

On Sun, Sep 27, 2009 at 08:46:45PM +0200, Sam Ravnborg wrote:
> Please look at the above and realise that cpu_die() is only ever defined
> in case that HOTPLUG_CPU is defined. So there is nothing to discard if
> HOTPLUG_CPU equals to n.
> 
> And just to repeat myself....
> The only correct use of __cpu* annotation is for function/data that is
> used with or without HOTPLUG_CPU equals to y.
> Which is NOT the case for cpu_die().
> 
> The __cpu* annotation is not a replacement for ifdeffed out code that is
> not relevant for the non-HOTPLUG_CPU case.

Ok.  But that still doesn't solve:

WARNING: arch/arm/kernel/built-in.o(.text+0x6274): Section mismatch in reference from the function cpu_die() to the function .cpuinit.text:secondary_start_kernel()
The function cpu_die() references
the function __cpuinit secondary_start_kernel().
This is often because cpu_die lacks a __cpuinit 
annotation or the annotation of secondary_start_kernel is wrong.

So are you saying secondary_start_kernel should not have __cpuinit?

That seems wrong, since we do want it to be discarded as __init in the
non-hotplug case, but we do want it kept around in the hotplug cpu
case.  I guess something like the following could be used instead:

#ifdef CONFIG_HOTPLUG_CPU
asmlinkage void secondary_start_kernel(void)
#else
asmlinkage void __init secondary_start_kernel(void)
#endif
{
...
}

but my understanding was that's what __cpuinit was supposed to be
doing for us in the first place.
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