From a33c1ba2913802b6fb23e974bb2f6a4e73c8b7ce Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 24 Nov 2014 15:02:42 -0700 Subject: [PATCH] blk-mq: use 'nr_cpu_ids' as highest CPU ID count for hwq <-> cpu map We currently use num_possible_cpus(), but that breaks on sparc64 where the CPU ID space is discontig. Use nr_cpu_ids as the highest CPU ID instead, so we don't end up reading from invalid memory. Cc: stable@kernel.org # 3.13+ Signed-off-by: Jens Axboe --- block/blk-mq-cpumap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c index 1065d7c65fa1..72e5ed691e37 100644 --- a/block/blk-mq-cpumap.c +++ b/block/blk-mq-cpumap.c @@ -90,7 +90,7 @@ unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set) unsigned int *map; /* If cpus are offline, map them to first hctx */ - map = kzalloc_node(sizeof(*map) * num_possible_cpus(), GFP_KERNEL, + map = kzalloc_node(sizeof(*map) * nr_cpu_ids, GFP_KERNEL, set->numa_node); if (!map) return NULL; -- 2.30.2