blk-iocost: use local[64]_t for percpu stat
blk-iocost has been reading percpu stat counters from remote cpus which on some archs can lead to torn reads in really rare occassions. Use local[64]_t for those counters. Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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