linux-kernel - Re: [Bug 8679] New: Section mismatch: reference to .init.text

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Message-Id: <20070626120134.17aa6143.randy.dunlap@oracle.com>
Date:	Tue, 26 Jun 2007 12:01:34 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	bugme-daemon@...zilla.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Cc:	wbrana@...il.com
Subject: Re: [Bug 8679] New: Section mismatch: reference to .init.text

On Tue, 26 Jun 2007 10:46:36 -0700 (PDT) bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8679
> 
>            Summary: Section mismatch: reference to .init.text
>            Product: Other
>            Version: 2.5
>      KernelVersion: 2.6.22-rc6
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Configuration
>         AssignedTo: zippel@...ux-m68k.org
>         ReportedBy: wbrana@...il.com
> 
> 
> Software Environment:
> gcc 3.4.6, binutils 2.17
> 
> Problem Description:
> Warnings appeared while building kernel:
> 
> WARNING: arch/i386/kernel/built-in.o(.data+0x2148): Section mismatch: reference
> to .init.text: (between 'thermal_throttle_cpu_notifier' and 'mtrr_mutex')
> WARNING: kernel/built-in.o(.text+0x15f84): Section mismatch: reference to
> .init.text: (between 'kthreadd' and 'init_waitqueue_head')


I don't see the kernel/built-in.o warning when I build this (I have
binutils 2.16++).  Can you test the patch below to verify that it
fixes the warning?

On the other warning ('thermal_throttle_cpu_notifier'), we have:

static struct notifier_block thermal_throttle_cpu_notifier =
{
	.notifier_call = thermal_throttle_cpu_callback,
};

where CONFIG_CPU_HOTPLUG=n, so __cpuinit == __init in:

static __cpuinit int thermal_throttle_cpu_callback(struct notifier_block *nfb,
						   unsigned long action,
						   void *hcpu)


so CPU hotplug actions should never happen here.  Still, we have
a registered notifier that is in __init space and has been discarded... :(
Any suggestions out there?



---
From: Randy Dunlap <randy.dunlap@...cle.com>

kthreadd_setup() is in an __init section, but we know that it's
safe to be called from kthreadd() since the latter is only called
at kernel init time, so mark kthreadd_setup() __init_refok so
that modpost won't complain about what text section it is in.

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
---
 kernel/kthread.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.22-rc6.orig/kernel/kthread.c
+++ linux-2.6.22-rc6/kernel/kthread.c
@@ -215,7 +215,7 @@ int kthread_stop(struct task_struct *k)
 EXPORT_SYMBOL(kthread_stop);
 
 
-static __init void kthreadd_setup(void)
+static __init_refok void kthreadd_setup(void)
 {
 	struct task_struct *tsk = current;
 
-
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