Commit a33c1ba2 authored Nov 24, 2014 by Jens Axboe

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 <axboe@fb.com>

parent 394ffa50

block/blk-mq-cpumap.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;