pseries/findnodes: On pseries systems which allow 'hot-add' of resources, we may boot configurations that have CPUs, but no memory associated to a node by the affinity calculations. Previously, the software took a shortcut to collapse initialization and references to such memoryless nodes with other nodes that did have memory associated with them at boot. This patch is based on fixes that allow the proper initialization and distinguishment of memoryless and memory-plus nodes after NUMA initialization. It extends the use of the 'node_to_mem_node()' API from 'topology.h' to modules that are allocating node-specific memory at boot, and allows such references to find available memory in another node.
Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com> --- block/blk-mq-cpumap.c | 3 ++- mm/page_alloc.c | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c index 9f8cffc..a27a31f 100644 --- a/block/blk-mq-cpumap.c +++ b/block/blk-mq-cpumap.c @@ -73,7 +73,8 @@ int blk_mq_hw_queue_to_node(unsigned int *mq_map, unsigned int index) for_each_possible_cpu(i) { if (index == mq_map[i]) - return local_memory_node(cpu_to_node(i)); + return local_memory_node( + node_to_mem_node(cpu_to_node(i))); } return NUMA_NO_NODE; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 77e4d3c..e7aaa2a 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4188,6 +4188,7 @@ struct page * gfp_mask &= gfp_allowed_mask; alloc_mask = gfp_mask; + preferred_nid = node_to_mem_node(preferred_nid); if (!prepare_alloc_pages(gfp_mask, order, preferred_nid, nodemask, &ac, &alloc_mask, &alloc_flags)) return NULL;