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Message-Id: <20200527052419.403583-16-hch@lst.de>
Date: Wed, 27 May 2020 07:24:18 +0200
From: Christoph Hellwig <hch@....de>
To: Jens Axboe <axboe@...nel.dk>
Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
Minchan Kim <minchan@...nel.org>,
Nitin Gupta <ngupta@...are.org>, dm-devel@...hat.com,
linux-block@...r.kernel.org, drbd-dev@...ts.linbit.com,
linux-bcache@...r.kernel.org, linux-nvdimm@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 15/16] block: use __this_cpu_add() instead of access by smp_processor_id()
From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
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@...dex-team.ru>
[hch: rebased]
Signed-off-by: Christoph Hellwig <hch@....de>
---
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
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