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    Subject[PATCH 1/4] Kernel config option for number of devices
    Date
    Allows configuring default number of zram devices
    as kernel config option. User can override this
    value using 'num_devices' module parameter.

    Signed-off-by: Nitin Gupta <ngupta@vflare.org>
    ---
    drivers/staging/zram/Kconfig | 9 +++++++++
    drivers/staging/zram/zram_drv.c | 13 ++++++++-----
    2 files changed, 17 insertions(+), 5 deletions(-)

    diff --git a/drivers/staging/zram/Kconfig b/drivers/staging/zram/Kconfig
    index 3bec4db..ca31cb3 100644
    --- a/drivers/staging/zram/Kconfig
    +++ b/drivers/staging/zram/Kconfig
    @@ -21,6 +21,15 @@ config ZRAM
    See zram.txt for more information.
    Project home: http://compcache.googlecode.com/

    +config ZRAM_NUM_DEVICES
    + int "Default number of zram devices"
    + depends on ZRAM
    + range 1 32
    + default 1
    + help
    + Select default number of zram devices. You can override this value
    + using 'num_devices' module parameter.
    +
    config ZRAM_DEBUG
    bool "Compressed RAM block device debug support"
    depends on ZRAM
    diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
    index d70ec1a..207234e 100644
    --- a/drivers/staging/zram/zram_drv.c
    +++ b/drivers/staging/zram/zram_drv.c
    @@ -780,6 +780,14 @@ static int __init zram_init(void)
    {
    int ret, dev_id;

    + /*
    + * Module parameter not specified by user. Use default
    + * value as defined during kernel config.
    + */
    + if (num_devices == 0) {
    + num_devices = CONFIG_ZRAM_NUM_DEVICES;
    + }
    +
    if (num_devices > max_num_devices) {
    pr_warning("Invalid value for num_devices: %u\n",
    num_devices);
    @@ -794,11 +802,6 @@ static int __init zram_init(void)
    goto out;
    }

    - if (!num_devices) {
    - pr_info("num_devices not specified. Using default: 1\n");
    - num_devices = 1;
    - }
    -
    /* Allocate the device array and initialize each one */
    pr_info("Creating %u devices ...\n", num_devices);
    devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL);
    --
    1.7.6


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