linux-kernel - Re: [PATCH] microcode: Fix mc_cpu

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Message-Id: <20061219083328.5951571f.khali@linux-fr.org>
Date:	Tue, 19 Dec 2006 08:33:28 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Tigran Aivazian <tigran@...azian.fsnet.co.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] microcode: Fix mc_cpu_notifier section warning

Hi Tigran,

On Mon, 18 Dec 2006 10:04:39 +0000 (GMT), Tigran Aivazian wrote:
> Ok, your patch is correct, although I assume you realize that it does 
> nothing --- both the function and the data it operates on are inside 
> CONFIG_HOTPLUG_CPU and checking include/linux/init.h I see that 
> __cpuinitdata is nothing in this case. E.g. msr_class_cpu_notifier in the 
> msr driver isn't declared __cpuinitdata...

I don't see anything in arch/i386/kernel/microcode.c depending on
CONFIG_HOTPLUG_CPU (in 2.6.20-rc1), sorry.

> But to tidy up one should add __cpuinitdata as you suggest (to guard for 
> the case if these two slip out of CONFIG_HOTPLUG_CPU, although they are 
> meaningless if cpu hotplug support is not configured in).
> 
> Kind regards
> Tigran
> 
> On Sun, 17 Dec 2006, Jean Delvare wrote:
> 
> > Structure mc_cpu_notifier references a __cpuinit function, but
> > isn't declared __cpuinitdata itself:
> >
> > WARNING: arch/i386/kernel/microcode.o - Section mismatch: reference
> > to .init.text: from .data after 'mc_cpu_notifier' (at offset 0x118)
> >
> > Signed-off-by: Jean Delvare <khali@...ux-fr.org>
> > ---
> > arch/i386/kernel/microcode.c |    2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > --- linux-2.6.20-rc1.orig/arch/i386/kernel/microcode.c	2006-12-15 09:05:20.000000000 +0100
> > +++ linux-2.6.20-rc1/arch/i386/kernel/microcode.c	2006-12-17 15:23:40.000000000 +0100
> > @@ -722,7 +722,7 @@
> > 	return NOTIFY_OK;
> > }
> >
> > -static struct notifier_block mc_cpu_notifier = {
> > +static struct notifier_block __cpuinitdata mc_cpu_notifier = {
> > 	.notifier_call = mc_cpu_callback,
> > };

-- 
Jean Delvare
-
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