[PATCH 15/16] block: use __this_cpu_add() instead of access by smp_processor_id()

From: Konstantin Khlebnikov <khlebnikov(a)yandex-team.ru&gt; Most architectures have fast path to access percpu for current cpu. The required preempt_disable() is provided by part_stat_lock(). Signed-off-by: Konstantin Khlebnikov <khlebnikov(a)yandex-team.ru&gt; [hch: rebased] Signed-off-by: Christoph Hellwig <hch(a)lst.de&gt; --- include/linux/part_stat.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h index a6b0938ce82e9..24125778ef3ec 100644 --- a/include/linux/part_stat.h +++ b/include/linux/part_stat.h @@ -54,7 +54,7 @@ static inline void part_stat_set_all(struct hd_struct *part, int value) part_stat_read(part, field[STAT_DISCARD])) #define __part_stat_add(part, field, addnd) \ - (part_stat_get(part, field) += (addnd)) + __this_cpu_add((part)->dkstats->field, addnd) #define part_stat_add(part, field, addnd) do { \ __part_stat_add((part), field, addnd); \ -- 2.26.2