From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Date: Wed, 27 May 2020 07:24:18 +0200
Subject: [PATCH] block: use __this_cpu_add() instead of access by
smp_processor_id()
Git-commit: b2d76adbc0828e0f108567973bcc500ed1abc139
Patch-mainline: v5.8-rc1
References: bsc#1175995,jsc#SLE-15608
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
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 a6b0938ce82e..24125778ef3e 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); \
--
2.16.4