linux-kernel - Re: [PATCH 2/3] mem-hotplug: Put kernel_physical_mapping_remove() declaration in CONFIG_MEMORY

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Date:	Tue, 16 Apr 2013 14:16:10 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	gregkh@...uxfoundation.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, yinghai@...nel.org, wency@...fujitsu.com,
	mgorman@...e.de, tj@...nel.org, liwanp@...ux.vnet.ibm.com,
	linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] mem-hotplug: Put kernel_physical_mapping_remove()
 declaration in CONFIG_MEMORY_HOTREMOVE.

On Mon, 15 Apr 2013 17:46:46 +0800 Tang Chen <tangchen@...fujitsu.com> wrote:

> kernel_physical_mapping_remove() is only called by arch_remove_memory() in
> init_64.c, which is enclosed in CONFIG_MEMORY_HOTREMOVE. So when we don't
> configure CONFIG_MEMORY_HOTREMOVE, the compiler will give a warning:
> 
> 	warning: ___kernel_physical_mapping_remove___ defined but not used
> 
> So put kernel_physical_mapping_remove() in CONFIG_MEMORY_HOTREMOVE.
> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> ---
>  arch/x86/mm/init_64.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 474e28f..dafdeb2 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -1019,6 +1019,7 @@ void __ref vmemmap_free(struct page *memmap, unsigned long nr_pages)
>  	remove_pagetable(start, end, false);
>  }
>  
> +#ifdef CONFIG_MEMORY_HOTREMOVE
>  static void __meminit
>  kernel_physical_mapping_remove(unsigned long start, unsigned long end)
>  {
> @@ -1028,7 +1029,6 @@ kernel_physical_mapping_remove(unsigned long start, unsigned long end)
>  	remove_pagetable(start, end, true);
>  }
>  
> -#ifdef CONFIG_MEMORY_HOTREMOVE
>  int __ref arch_remove_memory(u64 start, u64 size)
>  {
>  	unsigned long start_pfn = start >> PAGE_SHIFT;

Thanks.  I already have this one queued in
http://ozlabs.org/~akpm/mmots/broken-out/arch-x86-mm-init_64c-fix-build-warning-when-config_memory_hotremove=n.patch,
within my "send it to the x86 maintainers" section.

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