On (09/06/13 16:50), Jerome Marchand wrote:
> On 09/06/2013 03:52 PM, Sergey Senozhatsky wrote:
> > `zram->init_done != 0' equals to `zram->meta != NULL', so init_done
> > can be removed.
>
> The name init_done is self explanatory, meta isn't. You could for
> instance write a function with an explicit name to test for
> initialization.
init_done are pretty useless 4 bytes, they just mimic `!!zram->meta'
value (or `zram->meta != NULL'). well, we can have a macro or inline
function to return `zram->meta != NULL'
-ss
> Jerome
>
> >
> > Signed-off-by: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
> >
> > ---
> >
> > drivers/staging/zram/zram_drv.c | 18 +++++++-----------
> > drivers/staging/zram/zram_drv.h | 1 -
> > 2 files changed, 7 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/staging/zram/zram_drv.c
> > b/drivers/staging/zram/zram_drv.c
> > index 17386e2..34b72ea 100644
> > --- a/drivers/staging/zram/zram_drv.c
> > +++ b/drivers/staging/zram/zram_drv.c
> > @@ -60,7 +60,7 @@ static ssize_t initstate_show(struct device *dev,
> > {
> > struct zram *zram = dev_to_zram(dev);
> >
> > - return sprintf(buf, "%u\n", zram->init_done);
> > + return sprintf(buf, "%u\n", zram->meta != NULL);
> > }
> >
> > static ssize_t num_reads_show(struct device *dev,
> > @@ -133,7 +133,7 @@ static ssize_t mem_used_total_show(struct device *dev,
> > struct zram_meta *meta = zram->meta;
> >
> > down_read(&zram->init_lock);
> > - if (zram->init_done)
> > + if (meta)
> > val = zs_get_total_size_bytes(meta->mem_pool);
> > up_read(&zram->init_lock);
> >
> > @@ -556,14 +556,12 @@ static void zram_reset_device(struct zram *zram, bool
> > reset_capacity)
> > flush_work(&zram->free_work);
> >
> > down_write(&zram->init_lock);
> > - if (!zram->init_done) {
> > + if (!zram->meta) {
> > up_write(&zram->init_lock);
> > return;
> > }
> >
> > meta = zram->meta;
> > - zram->init_done = 0;
> > -
> > /* Free all pages that are still in this zram device */
> > for (index = 0; index < zram->disksize >> PAGE_SHIFT; index++) {
> > unsigned long handle = meta->table[index].handle;
> > @@ -573,7 +571,7 @@ static void zram_reset_device(struct zram *zram, bool
> > reset_capacity)
> > zs_free(meta->mem_pool, handle);
> > }
> >
> > - zram_meta_free(zram->meta);
> > + zram_meta_free(meta);
> > zram->meta = NULL;
> > /* Reset stats */
> > memset(&zram->stats, 0, sizeof(zram->stats));
> > @@ -602,9 +600,7 @@ 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;
> > - zram->init_done = 1;
> >
> > pr_debug("Initialization done!\n");
> > }
> > @@ -623,7 +619,7 @@ static ssize_t disksize_store(struct device *dev,
> > disksize = PAGE_ALIGN(disksize);
> > meta = zram_meta_alloc(disksize);
> > down_write(&zram->init_lock);
> > - if (zram->init_done) {
> > + if (zram->meta) {
> > up_write(&zram->init_lock);
> > zram_meta_free(meta);
> > pr_info("Cannot change disksize for initialized device\n");
> > @@ -731,7 +727,7 @@ static void zram_make_request(struct request_queue
> > *queue, struct bio *bio)
> > struct zram *zram = queue->queuedata;
> >
> > down_read(&zram->init_lock);
> > - if (unlikely(!zram->init_done))
> > + if (unlikely(!zram->meta))
> > goto error;
> >
> > if (!valid_io_request(zram, bio)) {
> > @@ -880,7 +876,7 @@ static int create_device(struct zram *zram, int
> > device_id)
> > goto out_free_disk;
> > }
> >
> > - zram->init_done = 0;
> > + zram->meta = NULL;
> > return 0;
> >
> > out_free_disk:
> > diff --git a/drivers/staging/zram/zram_drv.h
> > b/drivers/staging/zram/zram_drv.h
> > index 97a3acf..b1100cf 100644
> > --- a/drivers/staging/zram/zram_drv.h
> > +++ b/drivers/staging/zram/zram_drv.h
> > @@ -110,7 +110,6 @@ struct zram {
> >
> > struct request_queue *queue;
> > struct gendisk *disk;
> > - int init_done;
> > /* Prevent concurrent execution of device init, reset and R/W request */
> > struct rw_semaphore init_lock;
> > /*
> >
> > --
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> >
>
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