[PATCH 2/2] blk-iocost: Use alloc_percpu_gfp() to simplify the code

[Baolin Wang]

Use alloc_percpu_gfp() with __GFP_ZERO flag, which can remove
some explicit initialization code.

Signed-off-by: Baolin Wang <baolin.w...@linux.alibaba.com>
---
 block/blk-iocost.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index ac6078a..52ce2e3 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -2819,28 +2819,19 @@ static int blk_iocost_init(struct request_queue *q)
 {
        struct ioc *ioc;
        struct rq_qos *rqos;
-       int i, cpu, ret;
+       int ret;
+       gfp_t gfp = GFP_KERNEL | __GFP_ZERO;
 
        ioc = kzalloc(sizeof(*ioc), GFP_KERNEL);
        if (!ioc)
                return -ENOMEM;
 
-       ioc->pcpu_stat = alloc_percpu(struct ioc_pcpu_stat);
+       ioc->pcpu_stat = alloc_percpu_gfp(struct ioc_pcpu_stat, gfp);
        if (!ioc->pcpu_stat) {
                kfree(ioc);
                return -ENOMEM;
        }
 
-       for_each_possible_cpu(cpu) {
-               struct ioc_pcpu_stat *ccs = per_cpu_ptr(ioc->pcpu_stat, cpu);
-
-               for (i = 0; i < ARRAY_SIZE(ccs->missed); i++) {
-                       local_set(&ccs->missed[i].nr_met, 0);
-                       local_set(&ccs->missed[i].nr_missed, 0);
-               }
-               local64_set(&ccs->rq_wait_ns, 0);
-       }
-
        rqos = &ioc->rqos;
        rqos->id = RQ_QOS_COST;
        rqos->ops = &ioc_rqos_ops;
-- 
1.8.3.1