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

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Message-Id: <20070614183015.9DD7.Y-GOTO@jp.fujitsu.com>
Date:	Thu, 14 Jun 2007 18:32:32 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: mm: Fix memory/cpu hotplug section mismatch and oops.


Thanks. I tested compile with cpu/memory hotplug off/on.
It was OK.

Acked-by: Yasunori Goto <y-goto@...fujitsu.com>


> (This is a resend of the earlier patch, this issue still needs to be
> fixed.)
> 
> 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                     fo
> 
> This happens because CONFIG_HOTPLUG_CPU=n sets __cpuinit to __init, but
> CONFIG_MEMORY_HOTPLUG=y unsets __meminit.
> 
> Changing zone_batchsize() to __devinit fixes this.
> 
> __devinit is the only thing that is common between CONFIG_HOTPLUG_CPU=y and
> CONFIG_MEMORY_HOTPLUG=y. In the long run, perhaps this should be moved to
> another section identifier completely. Without this, memory hot-add
> of offline nodes (via hotadd_new_pgdat()) will oops if CPU hotplug is
> not also enabled.
> 
> Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
> 
> --
> 
>  mm/page_alloc.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 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;
>  
> -
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-- 
Yasunori Goto 


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