• Mel Gorman's avatar
    mm: memory hotplug: Check if pages are correctly reserved on a per-section basis · 2bbcb878
    Mel Gorman authored
    (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: default avatarMel Gorman <mgorman@suse.de>
    Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Tested-by: default avatarNathan Fontenot <nfont@linux.vnet.ibm.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    2bbcb878
memory.c 16.8 KB