On Mon, 17 Oct 2011, Mel Gorman wrote: > (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@xxxxxxxxxx] > [original patch by: nfont@xxxxxxxxxxxxxxxxxx] > Signed-off-by: Mel Gorman <mgorman@xxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>