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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2014-04-07 15:38:09 -0700 |
|---|---|---|
| committer | Simon Shields <keepcalm444@gmail.com> | 2016-06-12 21:20:00 +1000 |
| commit | 64d8df891e3d1f187f129df667f7b347d5612b37 (patch) | |
| tree | 35b2ada4ed04fad17b9344bf0f31b2dc4971b811 /drivers | |
| parent | c20ebd785b1ce8e68f4f9eafdaf1ea1f7fa2eff8 (diff) | |
| download | kernel_samsung_smdk4412-64d8df891e3d1f187f129df667f7b347d5612b37.zip kernel_samsung_smdk4412-64d8df891e3d1f187f129df667f7b347d5612b37.tar.gz kernel_samsung_smdk4412-64d8df891e3d1f187f129df667f7b347d5612b37.tar.bz2 | |
zram: delete zram_init_device()
allocate new `zram_meta' in disksize_store() only for uninitialised zram
device, saving a number of allocations and deallocations in case if
disksize_store() was called on currently used device. at the same time
zram_meta stack variable is not necessary, because we can set ->meta
directly. there is also no need in setting QUEUE_FLAG_NONROT queue on
every disksize_store(), set it once during device creation.
[minchan@kernel.org: handle zram->meta alloc fail case]
[minchan@kernel.org: prevent lockdep spew of init_lock]
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 70d7adc..f37f3b0 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -544,14 +544,6 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity) up_write(&zram->init_lock); } -static void zram_init_device(struct zram *zram, struct zram_meta *meta) -{ - /* zram devices sort of resembles non-rotational disks */ - queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue); - zram->meta = meta; - pr_debug("Initialization done!\n"); -} - static ssize_t disksize_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { @@ -567,17 +559,18 @@ static ssize_t disksize_store(struct device *dev, meta = zram_meta_alloc(disksize); if (!meta) return -ENOMEM; + down_write(&zram->init_lock); if (init_done(zram)) { - up_write(&zram->init_lock); zram_meta_free(meta); + up_write(&zram->init_lock); pr_info("Cannot change disksize for initialized device\n"); return -EBUSY; } + zram->meta = meta; zram->disksize = disksize; set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT); - zram_init_device(zram, meta); up_write(&zram->init_lock); return len; @@ -787,7 +780,8 @@ static int create_device(struct zram *zram, int device_id) /* Actual capacity set using syfs (/sys/block/zram<id>/disksize */ set_capacity(zram->disk, 0); - + /* zram devices sort of resembles non-rotational disks */ + queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue); /* * To ensure that we always get PAGE_SIZE aligned * and n*PAGE_SIZED sized I/O requests. |