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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>
This commit is contained in:
Jens Axboe 2014-11-24 15:02:42 -07:00
parent 394ffa503b
commit a33c1ba291
1 changed files with 1 additions and 1 deletions
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2
block/blk-mq-cpumap.c
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@ -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;