memory hotplug: alloc page from other node in memory online

To initialize hotadded node, some pages are allocated.  At that time, the
node hasn't memory, this makes the allocation always fail.  In such case,
let's allocate pages from other nodes.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Yakui Zhao <yakui.zhao@intel.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index a13ea6401ae7..d9714bdcb4a3 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -48,8 +48,14 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node)
 {
         /* If the main allocator is up use that, fallback to bootmem. */
         if (slab_is_available()) {
-                struct page *page = alloc_pages_node(node,
+                struct page *page;
+
+                if (node_state(node, N_HIGH_MEMORY))
+                        page = alloc_pages_node(node,
                                 GFP_KERNEL | __GFP_ZERO, get_order(size));
+                else
+                        page = alloc_pages(GFP_KERNEL | __GFP_ZERO,
+                                get_order(size));
                 if (page)
                         return page_address(page);
                 return NULL;