diff options
author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2014-04-07 15:38:09 -0700 |
---|---|---|
committer | Alex Shi <alex.shi@linaro.org> | 2015-05-11 20:41:58 +0800 |
commit | 6ab557fb5b5851a3848743ad6df597323b9d39ee (patch) | |
tree | 40beea03b965e502c87a679b2ce0702598ec18f8 /drivers/block | |
parent | 65281bd78e42b4137f9cf87c4b734ff2325bf483 (diff) |
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>
(cherry picked from commit b67d1ec189ffb92cdad9b2bd29475fb1e0166983)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'drivers/block')
-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 a083dffb699e..9c71757aa1c6 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -532,14 +532,6 @@ 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) { @@ -555,17 +547,18 @@ 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; @@ -774,7 +767,8 @@ 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. |