[PATCH v3 0/2] memory-hotplug: introduce CONFIG_HAVE_BOOTMEM_INFO_NODE and revert register_page_boot

Lin Feng
2013-01-16T08:14:17Z

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(-)