linux-kernel - Re: [PATCH v4 2/2] mm/page_alloc.c: introduce kernelcore=mirror option

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Date:	Fri, 8 Jan 2016 15:12:23 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	Taku Izumi <izumi.taku@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	tony.luck@...el.com, qiuxishi@...wei.com,
	kamezawa.hiroyu@...fujitsu.com, mel@....ul.ie,
	dave.hansen@...el.com, matt@...eblueprint.co.uk, arnd@...db.de,
	steve.capper@...aro.org
Subject: Re: [PATCH v4 2/2] mm/page_alloc.c: introduce kernelcore=mirror
 option

On Fri, 8 Jan 2016 17:02:39 +0000 Sudeep Holla <sudeep.holla@....com> wrote:

> > +
> > +			/*
> > +			 * if not mirrored_kernelcore and ZONE_MOVABLE exists,
> > +			 * range from zone_movable_pfn[nid] to end of each node
> > +			 * should be ZONE_MOVABLE not ZONE_NORMAL. skip it.
> > +			 */
> > +			if (!mirrored_kernelcore && zone_movable_pfn[nid])
> > +				if (zone == ZONE_NORMAL &&
> > +				    pfn >= zone_movable_pfn[nid])
> > +					continue;
> > +
> 
> I tried this with today's -next, the above lines gave compilation error.
> Moved them below into HAVE_MEMBLOCK_NODE_MAP and tested it on ARM64.
> I don't see the previous backtraces. Let me know if that's correct or
> you can post a version that compiles correctly and I can give a try.

Thanks.   I'll include the below and shall add your tested-by:, OK?

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: mm-page_allocc-introduce-kernelcore=mirror-option-fix

fix build with CONFIG_HAVE_MEMBLOCK_NODE_MAP=n

Reported-by: Sudeep Holla <sudeep.holla@....com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Steve Capper <steve.capper@...aro.org>
Cc: Taku Izumi <izumi.taku@...fujitsu.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Xishi Qiu <qiuxishi@...wei.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN Documentation/kernel-parameters.txt~mm-page_allocc-introduce-kernelcore=mirror-option-fix Documentation/kernel-parameters.txt
diff -puN mm/page_alloc.c~mm-page_allocc-introduce-kernelcore=mirror-option-fix mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_allocc-introduce-kernelcore=mirror-option-fix
+++ a/mm/page_alloc.c
@@ -4627,6 +4627,7 @@ void __meminit memmap_init_zone(unsigned
 						&nr_initialised))
 				break;
 
+#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 			/*
 			 * if not mirrored_kernelcore and ZONE_MOVABLE exists,
 			 * range from zone_movable_pfn[nid] to end of each node
@@ -4637,7 +4638,6 @@ void __meminit memmap_init_zone(unsigned
 				    pfn >= zone_movable_pfn[nid])
 					continue;
 
-#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
 			/*
 			 * check given memblock attribute by firmware which
 			 * can affect kernel memory layout.
_