[15/16] block: use __this_cpu_add() instead of access by smp_processor_id()
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Message ID 20200527052419.403583-16-hch@lst.de
State New
Headers show
Series
  • [01/16] block: add disk/bio-based accounting helpers
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Commit Message

Christoph Hellwig May 27, 2020, 5:24 a.m. UTC
From: Konstantin Khlebnikov <khlebnikov@yandex-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@yandex-team.ru>
[hch: rebased]
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 include/linux/part_stat.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
diff mbox series

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);				\