Commit b2d76adb authored May 27, 2020 by Konstantin Khlebnikov Committed by Jens Axboe May 27, 2020

block: use __this_cpu_add() instead of access by smp_processor_id()



Most architectures have fast path to access percpu for current cpu.
The required preempt_disable() is provided by part_stat_lock().

[hch: rebased]

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 8ab1d40a

include/linux/part_stat.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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); \

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