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authorMing Lei <tom.leiming@gmail.com>2015-07-16 11:16:45 +0800
committerJens Axboe <axboe@fb.com>2015-07-17 08:41:53 -0600
commit6c71013ecb7e2bddbed9f5b95e7aed22c491daa9 (patch)
tree773a3ebe4289815e677ce2b357c665cba5292c0e /block/genhd.c
parentb54e5ed8f285d62c0d242c4ef9da90937994db02 (diff)
downloadop-kernel-dev-6c71013ecb7e2bddbed9f5b95e7aed22c491daa9.zip
op-kernel-dev-6c71013ecb7e2bddbed9f5b95e7aed22c491daa9.tar.gz
block: partition: convert percpu ref
Percpu refcount is the perfect match for partition's case, and the conversion is quite straight. With the convertion, one pair of atomic inc/dec can be saved for accounting block I/O, which is run in hot path of block I/O. Signed-off-by: Ming Lei <tom.leiming@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 85df452..0c706f3 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1284,7 +1284,11 @@ struct gendisk *alloc_disk_node(int minors, int node_id)
* converted to make use of bd_mutex and sequence counters.
*/
seqcount_init(&disk->part0.nr_sects_seq);
- hd_ref_init(&disk->part0);
+ if (hd_ref_init(&disk->part0)) {
+ hd_free_part(&disk->part0);
+ kfree(disk);
+ return NULL;
+ }
disk->minors = minors;
rand_initialize_disk(disk);
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