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authorJens Axboe <axboe@fb.com>2014-11-24 15:02:42 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-16 06:59:31 -0800
commitbdc69c2acca3f51e7f572c1e2a823894b16572e9 (patch)
tree362efa9d0b60cce24f9d22b51e03db0e37e9fc05 /block/blk-mq-cpumap.c
parent4ce9fbccfb9ee64bec6ac125150e2beac5f0c42f (diff)
downloadlinux-linaro-stable-bdc69c2acca3f51e7f572c1e2a823894b16572e9.tar.gz
blk-mq: use 'nr_cpu_ids' as highest CPU ID count for hwq <-> cpu map
commit a33c1ba2913802b6fb23e974bb2f6a4e73c8b7ce upstream. 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. Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 f8721278601c..78d38352bf8d 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -95,7 +95,7 @@ unsigned int *blk_mq_make_queue_map(struct blk_mq_reg *reg)
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,
reg->numa_node);
if (!map)
return NULL;