diff options
| author | Konstantin Khlebnikov <khlebnikov@yandex-team.ru> | 2020-05-27 08:24:17 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-05-27 14:21:23 +0300 |
| commit | 8ab1d40a646e753adb6814642432a093d93dbf47 (patch) | |
| tree | f70e9ee9cc1ea5823cba3865f380a597ef5db3ca /include/linux/part_stat.h | |
| parent | b5af37ab3a2b143e278340d2c6fa5790d53817e7 (diff) | |
| download | linux-8ab1d40a646e753adb6814642432a093d93dbf47.tar.xz | |
block: remove rcu_read_lock() from part_stat_lock()
The RCU lock is required only in disk_map_sector_rcu() to lookup the
partition. After that request holds reference to related hd_struct.
Replace get_cpu() with preempt_disable() - returned cpu index is unused.
[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>
Diffstat (limited to 'include/linux/part_stat.h')
| -rw-r--r-- | include/linux/part_stat.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/part_stat.h b/include/linux/part_stat.h index 6644197980b9..a6b0938ce82e 100644 --- a/include/linux/part_stat.h +++ b/include/linux/part_stat.h @@ -21,8 +21,8 @@ struct disk_stats { * * part_stat_read() can be called at any time. */ -#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) -#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) +#define part_stat_lock() preempt_disable() +#define part_stat_unlock() preempt_enable() #define part_stat_get_cpu(part, field, cpu) \ (per_cpu_ptr((part)->dkstats, (cpu))->field) |