linux-kernel - [PATCH v3 0/2] memory-hotplug: introduce CONFIG_HAVE_BOOTMEM_INFO_NODE and revert register_page_bootmem_info

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Date:	Wed, 16 Jan 2013 16:14:17 +0800
From:	Lin Feng <linfeng@...fujitsu.com>
To:	akpm@...ux-foundation.org, mhocko@...e.cz, linux-mm@...ck.org,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	jbeulich@...e.com, dhowells@...hat.com, wency@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, paul.gortmaker@...driver.com,
	laijs@...fujitsu.com, kamezawa.hiroyu@...fujitsu.com,
	mel@....ul.ie, minchan@...nel.org, aquini@...hat.com,
	jiang.liu@...wei.com, tony.luck@...el.com, fenghua.yu@...el.com,
	benh@...nel.crashing.org, paulus@...ba.org, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, davem@...emloft.net,
	michael@...erman.id.au, gerald.schaefer@...ibm.com,
	gregkh@...uxfoundation.org
Cc:	x86@...nel.org, linux390@...ibm.com, linux-ia64@...r.kernel.org,
	linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linfeng@...fujitsu.com, tangchen@...fujitsu.com
Subject: [PATCH v3 0/2] memory-hotplug: introduce CONFIG_HAVE_BOOTMEM_INFO_NODE and revert register_page_bootmem_info_node() when platform not support

Memory-hotplug codes for x86_64 have been implemented by patchset:
https://lkml.org/lkml/2013/1/9/124
While other platforms haven't been completely implemented yet.

If we enable both CONFIG_MEMORY_HOTPLUG_SPARSE and CONFIG_SPARSEMEM_VMEMMAP,
register_page_bootmem_info_node() may be buggy, which is a hotplug generic
function but falling back to call platform related function
register_page_bootmem_memmap().

Other platforms such as powerpc it's not implemented, so on such platforms,
revert them to empty as they were before.

It's implemented by adding a new Kconfig option named
CONFIG_HAVE_BOOTMEM_INFO_NODE, which will be automatically selected by
memory-hotplug supported archs(currently only on x86_64).

changeLog v2->v3:
1) patch 1/2:
- Rename the patch title to conform it's content.
- Update memory_hotplug.h and remove the misleading TODO pointed out by Michal.
2) patch 2/2:
- New added, remove unimplemented functions suggested by Michal.

ChangeLog v1->v2:
1) patch 1/2:
- Add a Kconfig option named HAVE_BOOTMEM_INFO_NODE suggested by Michal, which
  will be automatically selected by supported archs(currently only on x86_64).

Lin Feng (1):
  memory-hotplug: revert register_page_bootmem_info_node() to empty
    when platform related code is not implemented

Michal Hocko (1):
  memory-hotplug: cleanup: removing the arch specific functions without
    any implementation

 arch/ia64/mm/discontig.c       |    5 -----
 arch/powerpc/mm/init_64.c      |    5 -----
 arch/s390/mm/vmem.c            |    6 ------
 arch/sparc/mm/init_64.c        |    5 -----
 arch/x86/mm/init_64.c          |    2 +-
 include/linux/memory_hotplug.h |    6 ++++++
 mm/Kconfig                     |    8 ++++++++
 mm/memory_hotplug.c            |    2 ++
 8 files changed, 17 insertions(+), 22 deletions(-)

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