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authorMel Gorman <mgorman@suse.de>2011-10-17 16:38:20 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-10-18 14:01:24 -0700
commit2bbcb8788311a40714b585fc11b51da6ffa2ab92 (patch)
tree05981b0261c3fe7d8ebe6e64a66ed71954b19997 /lib
parentde0ed36a3ecc0b51da4f16fa0af47ba6b7ffad22 (diff)
mm: memory hotplug: Check if pages are correctly reserved on a per-section basis
(Resending as I am not seeing it in -next so maybe it got lost) mm: memory hotplug: Check if pages are correctly reserved on a per-section basis It is expected that memory being brought online is PageReserved similar to what happens when the page allocator is being brought up. Memory is onlined in "memory blocks" which consist of one or more sections. Unfortunately, the code that verifies PageReserved is currently assuming that the memmap backing all these pages is virtually contiguous which is only the case when CONFIG_SPARSEMEM_VMEMMAP is set. As a result, memory hot-add is failing on those configurations with the message; kernel: section number XXX page number 256 not reserved, was it already online? This patch updates the PageReserved check to lookup struct page once per section to guarantee the correct struct page is being checked. [Check pages within sections properly: rientjes@google.com] [original patch by: nfont@linux.vnet.ibm.com] Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Tested-by: Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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