linux-kernel - Re: 2.6.23-rc8-mm1 - powerpc memory hotplug link failure

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Message-Id: <1190757715.13955.40.camel@dyn9047017100.beaverton.ibm.com>
Date:	Tue, 25 Sep 2007 15:01:54 -0700
From:	Badari Pulavarty <pbadari@...il.com>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, kamezawa.hiroyu@...fujitsu.com,
	Andy Whitcroft <apw@...dowen.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: 2.6.23-rc8-mm1 - powerpc memory hotplug link failure

On Wed, 2007-09-26 at 01:30 +0530, Kamalesh Babulal wrote:
> Hi Andrew,
> 
> The 2.6.23-rc8-mm1 kernel linking fails on the powerpc (P5+) box
> 
>   CC      init/version.o
>   LD      init/built-in.o
>   LD      .tmp_vmlinux1
> drivers/built-in.o: In function `memory_block_action':
> /root/scrap/linux-2.6.23-rc8/drivers/base/memory.c:188: undefined reference to `.remove_memory'
> make: *** [.tmp_vmlinux1] Error 1
> 

I ran into the same thing earlier. Here is the fix I made.

Thanks,
Badari

Memory hotplug remove is currently supported only on IA64

Signed-off-by: Badari Pulavarty <pbadari@...ibm.com>

Index: linux-2.6.23-rc8/mm/Kconfig
===================================================================
--- linux-2.6.23-rc8.orig/mm/Kconfig	2007-09-25 14:44:03.000000000 -0700
+++ linux-2.6.23-rc8/mm/Kconfig	2007-09-25 14:44:48.000000000 -0700
@@ -143,6 +143,7 @@ config MEMORY_HOTREMOVE
 	bool "Allow for memory hot remove"
 	depends on MEMORY_HOTPLUG
 	depends on MIGRATION
+	depends on (IA64)
 
 # Heavily threaded applications may benefit from splitting the mm-wide
 # page_table_lock, so that faults on different parts of the user address


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