mm: clear N_CPU from node_states at CPU offline
vmstat_cpuup_callback() is a CPU notifier callback, which marks N_CPU to a node at CPU online event. However, it does not update this N_CPU info at CPU offline event. Changed vmstat_cpuup_callback() to clear N_CPU when the last CPU in the node is put into offline, i.e. the node no longer has any online CPU. Signed-off-by: Toshi Kani <toshi.kani@hp.com> Acked-by: Christoph Lameter <cl@linux.com> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Tested-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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