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authorJens Axboe <axboe@fb.com>2014-11-24 15:02:42 -0700
committerJens Axboe <axboe@fb.com>2014-11-24 15:02:42 -0700
commita33c1ba2913802b6fb23e974bb2f6a4e73c8b7ce (patch)
treef1dbb27e9804ed4f8368e4eb0169b7325ec0792f /block/blk-mq-cpumap.c
parent394ffa503bc40e32d7f54a9b817264e81ce131b4 (diff)
downloadkernel-a33c1ba2913802b6fb23e974bb2f6a4e73c8b7ce.tar.gz
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>
Diffstat (limited to 'block/blk-mq-cpumap.c')
-rw-r--r--block/blk-mq-cpumap.c2
1 files changed, 1 insertions, 1 deletions
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;