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memory hotplug: Hot-add with sparsemem-vmemmap

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This patch is to avoid panic when memory hot-add is executed with
sparsemem-vmemmap.  Current vmemmap-sparsemem code doesn't support memory
hot-add.  Vmemmap must be populated when hot-add.  This is for
2.6.23-rc2-mm2.

Todo: # Even if this patch is applied, the message "[xxxx-xxxx] potential
        offnode page_structs" is displayed. To allocate memmap on its node,
        memmap (and pgdat) must be initialized itself like chicken and
        egg relationship.

      # vmemmap_unpopulate will be necessary for followings.
         - For cancel hot-add due to error.
         - For unplug.

Signed-off-by: Yasunori Goto <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yasunori Goto 2007-10-16 01:26:14 -07:00 • committed by Linus Torvalds
commit 98f3cfc1dc
3 changed files with 24 additions and 5 deletions
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2
mm/sparse-vmemmap.c
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@ -137,7 +137,7 @@ int __meminit vmemmap_populate_basepages(struct page *start_page,
return 0;
}
struct page __init *sparse_early_mem_map_populate(unsigned long pnum, int nid)
struct page * __meminit sparse_mem_map_populate(unsigned long pnum, int nid)
{
struct page *map = pfn_to_page(pnum * PAGES_PER_SECTION);
int error = vmemmap_populate(map, PAGES_PER_SECTION, nid);