Currently fallback nodes for offline nodes aren't set. Hence by default node 0 ends up being the default node. However node 0 might be offline. Fix this by explicitly setting fallback node. Ensure first_memory_node is set before kernel does explicit setting of fallback node. Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Christopher Lameter <cl@xxxxxxxxx> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> Cc: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> Cc: Bharata B Rao <bharata@xxxxxxxxxxxxx> Reported-by: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx> Tested-by: Sachin Sant <sachinp@xxxxxxxxxxxxxxxxxx> Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> --- arch/powerpc/mm/numa.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 281531340230..6e97ab6575cb 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -827,7 +827,16 @@ void __init dump_numa_cpu_topology(void) if (!numa_enabled) return; - for_each_online_node(node) { + for_each_node(node) { + /* + * For all possible but not yet online nodes, ensure their + * node_numa_mem is set correctly so that kmalloc_node works + * for such nodes. + */ + if (!node_online(node)) { + reset_numa_mem(node); + continue; + } pr_info("Node %d CPUs:", node); count = 0; -- 2.18.1