linux-kernel - Re: [PATCH] mm/memory hotplug: print the last vmemmap region at the end of hot add memory

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Message-Id: <20150609132908.c5a9d2c9714bd7a8f33ffde8@linux-foundation.org>
Date:	Tue, 9 Jun 2015 13:29:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Zhu Guihua <zhugh.fnst@...fujitsu.com>
Cc:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<vbabka@...e.cz>, <rientjes@...gle.com>,
	<n-horiguchi@...jp.nec.com>, <zhenzhang.zhang@...wei.com>,
	<wangnan0@...wei.com>, <fabf@...net.be>
Subject: Re: [PATCH] mm/memory hotplug: print the last vmemmap region at the
 end of hot add memory

On Tue, 9 Jun 2015 11:41:28 +0800 Zhu Guihua <zhugh.fnst@...fujitsu.com> wrote:

> >> --- a/mm/memory_hotplug.c
> >> +++ b/mm/memory_hotplug.c
> >> @@ -513,6 +513,7 @@ int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
> >>   			break;
> >>   		err = 0;
> >>   	}
> >> +	vmemmap_populate_print_last();
> >>   
> >>   	return err;
> >>   }
> > vmemmap_populate_print_last() is only available on x86_64, when
> > CONFIG_SPARSEMEM_VMEMMAP=y.  Are you sure this won't break builds?
> 
> I tried this on i386 and on x86_64 when CONFIG_SPARSEMEM_VMEMMAP=n ,
> it builds ok.

With powerpc:

akpm3:/usr/src/25> make allmodconfig
akpm3:/usr/src/25> make mm/memory_hotplug.o
akpm3:/usr/src/25> nm mm/memory_hotplug.o | grep vmemmap_populate_print_last
	U .vmemmap_populate_print_last
akpm3:/usr/src/25> grep -r vmemmap_populate_print_last arch/powerpc
akpm3:/usr/src/25> 

So I think that's going to break.

I expect ia64 will break also, but I didn't investigate.
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