linux-kernel - Re: [Patch] Fix section mismatch of memory hotplug related code.

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Date:	Fri, 4 May 2007 17:04:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yasunori Goto <y-goto@...fujitsu.com>
Cc:	Linux Kernel ML <linux-kernel@...r.kernel.org>,
	Miles Lane <miles.lane@...il.com>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [Patch] Fix section mismatch of memory hotplug related code.

On Thu, 05 Apr 2007 17:01:02 +0900
Yasunori Goto <y-goto@...fujitsu.com> wrote:

> Hello.
> 
> This is to fix many section mismatches of code related to memory hotplug.
> I checked compile with memory hotplug on/off on ia64 and x86-64 box.
> 
> ..
>
> ===================================================================
> --- meminit.orig/drivers/acpi/numa.c	2007-04-04 20:15:58.000000000 +0900
> +++ meminit/drivers/acpi/numa.c	2007-04-04 20:56:34.000000000 +0900
> @@ -228,7 +228,7 @@ int __init acpi_numa_init(void)
>  	return 0;
>  }
>  
> -int acpi_get_pxm(acpi_handle h)
> +int __meminit acpi_get_pxm(acpi_handle h)
>  {
>  	unsigned long pxm;
>  	acpi_status status;
> @@ -246,7 +246,7 @@ int acpi_get_pxm(acpi_handle h)
>  }
>  EXPORT_SYMBOL(acpi_get_pxm);
>  
> -int acpi_get_node(acpi_handle *handle)
> +int __meminit acpi_get_node(acpi_handle *handle)
>  {
>  	int pxm, node = -1;

It doesn't make a lot of sense to export an __init symbol to modules.  I
guess it's OK in this case, but we get warnings:

WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:acpi_get_node from __ksymtab between '__ksymtab_acpi_get_node' (at offset 0x1040) and '__ksymtab_acpi_get_pxm'
WARNING: drivers/built-in.o - Section mismatch: reference to .init.text:acpi_get_pxm from __ksymtab between '__ksymtab_acpi_get_pxm' (at offset 0x1050) and '__ksymtab_acpi_unlock_battery_dir'

One fix would be to statically link them again.  Another fix would be to
wrap the exports in #ifdef CONFIG_ACPI_HOTPLUG_MEMORY_MODULE.  Neither is
very attractive.

Coold you have a think about it please?  The config is at
http://userweb.kernel.org/~akpm/config-akpm2.txt

Thanks.
-
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