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authorYasunori Goto <y-goto@jp.fujitsu.com>2007-10-16 01:26:14 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:02 -0700
commit98f3cfc1dc7a53b629d43b7844a9b3f786213048 (patch)
treede98ff0e3c25b01863c31abc0f3054de978b9ef8 /mm/sparse.c
parent48e94196a533dbee17c252bf80d0310fb8c8c2eb (diff)
downloadlinux-98f3cfc1dc7a53b629d43b7844a9b3f786213048.tar.gz
memory hotplug: Hot-add with sparsemem-vmemmap
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 <y-goto@jp.fujitsu.com> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Christoph Lameter <clameter@sgi.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
-rw-r--r--mm/sparse.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/mm/sparse.c b/mm/sparse.c
index 1f4dbb867b8..08fb14f5eea 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -259,7 +259,7 @@ static unsigned long *sparse_early_usemap_alloc(unsigned long pnum)
}
#ifndef CONFIG_SPARSEMEM_VMEMMAP
-struct page __init *sparse_early_mem_map_populate(unsigned long pnum, int nid)
+struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid)
{
struct page *map;
@@ -284,7 +284,7 @@ struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
struct mem_section *ms = __nr_to_section(pnum);
int nid = sparse_early_nid(ms);
- map = sparse_early_mem_map_populate(pnum, nid);
+ map = sparse_mem_map_populate(pnum, nid);
if (map)
return map;
@@ -322,6 +322,18 @@ void __init sparse_init(void)
}
#ifdef CONFIG_MEMORY_HOTPLUG
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
+ unsigned long nr_pages)
+{
+ /* This will make the necessary allocations eventually. */
+ return sparse_mem_map_populate(pnum, nid);
+}
+static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
+{
+ return; /* XXX: Not implemented yet */
+}
+#else
static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
{
struct page *page, *ret;
@@ -344,6 +356,12 @@ got_map_ptr:
return ret;
}
+static inline struct page *kmalloc_section_memmap(unsigned long pnum, int nid,
+ unsigned long nr_pages)
+{
+ return __kmalloc_section_memmap(nr_pages);
+}
+
static int vaddr_in_vmalloc_area(void *addr)
{
if (addr >= (void *)VMALLOC_START &&
@@ -360,6 +378,7 @@ static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
free_pages((unsigned long)memmap,
get_order(sizeof(struct page) * nr_pages));
}
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
/*
* returns the number of sections whose mem_maps were properly
@@ -382,7 +401,7 @@ int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
* plus, it does a kmalloc
*/
sparse_index_init(section_nr, pgdat->node_id);
- memmap = __kmalloc_section_memmap(nr_pages);
+ memmap = kmalloc_section_memmap(section_nr, pgdat->node_id, nr_pages);
usemap = __kmalloc_section_usemap();
pgdat_resize_lock(pgdat, &flags);