linux-kernel - Re: mm: memory/cpu hotplug section mismatch.

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Message-Id: <20070611082732.70018522.randy.dunlap@oracle.com>
Date:	Mon, 11 Jun 2007 08:27:32 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Sam Ravnborg <sam@...nborg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: mm: memory/cpu hotplug section mismatch.

On Mon, 11 Jun 2007 14:09:55 +0900 Paul Mundt wrote:

> On Mon, Jun 11, 2007 at 02:01:45PM +0900, KAMEZAWA Hiroyuki wrote:
> > On Mon, 11 Jun 2007 13:35:43 +0900
> > Paul Mundt <lethal@...ux-sh.org> wrote:
> > 
> > > When building with memory hotplug enabled and cpu hotplug disabled, we
> > > end up with the following section mismatch:
> > > 
> > > WARNING: mm/built-in.o(.text+0x4e58): Section mismatch: reference to
> > > .init.text: (between 'free_area_init_node' and '__build_all_zonelists')
> > > 
> > > This happens as a result of:
> > > 
> > > 	-> free_area_init_node()
> > > 	  -> free_area_init_core()
> > > 	    -> zone_pcp_init() <-- all __meminit up to this point
> > > 	      -> zone_batchsize() <-- marked as __cpuinit
> > > 
> > > This happens because CONFIG_HOTPLUG_CPU=n sets __cpuinit to __init, but
> > > CONFIG_MEMORY_HOTPLUG=y unsets __meminit.
> > > 
> > > Changing zone_batchsize() to __init_refok fixes this.
> > > 
> > 
> > It seems this zone_batchsize() is called by cpu-hotplug and memory-hotplug.
> > So, __init_refok doesn't look good, here.
> > 
> > maybe we can use __devinit here. (Because HOTPLUG_CPU and MEMORY_HOTPLUG are
> > depend on CONFIG_HOTPLUG.)
> > 
> Yes, that's probably a more reasonable way to go. The __devinit name is a
> bit misleading, though..

__meminit does not fit/work here?


> --
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index bd8e335..05ace44 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1968,7 +1968,7 @@ void zone_init_free_lists(struct pglist_data *pgdat, struct zone *zone,
>  	memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY)
>  #endif
>  
> -static int __cpuinit zone_batchsize(struct zone *zone)
> +static int __devinit zone_batchsize(struct zone *zone)
>  {
>  	int batch;
>  


---
~Randy
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