zram accepts number of devices to be created
as a module parameter. This was renamed from
num_devices to zram_num_devices (without updating
the documentation!) since num_devices was declared
as a non-static global variable, polluting the global
namespace. Now, we declare it as a static variable
and revert back the name change.
The documentation (zram.txt) already mentions
num_devices as the module parameter name.
Signed-off-by: Nitin Gupta <ngupta@xxxxxxxxxx>
---
drivers/staging/zram/zram_drv.c | 27 ++++++++++++++++-----------
drivers/staging/zram/zram_drv.h | 2 +-
drivers/staging/zram/zram_sysfs.c | 2 +-
3 files changed, 18 insertions(+), 13 deletions(-)
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 5833156..7f13819 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -40,7 +40,7 @@ static int zram_major;
struct zram *zram_devices;
/* Module params (documentation at end) */
-unsigned int zram_num_devices;
+static unsigned int num_devices;
static void zram_stat_inc(u32 *v)
{
@@ -779,13 +779,18 @@ static void destroy_device(struct zram *zram)
blk_cleanup_queue(zram->queue);
}
+unsigned int zram_get_num_devices(void)
+{
+ return num_devices;
+}
+
static int __init zram_init(void)
{
int ret, dev_id;
- if (zram_num_devices > max_num_devices) {
+ if (num_devices > max_num_devices) {
pr_warning("Invalid value for num_devices: %u\n",
- zram_num_devices);
+ num_devices);
ret = -EINVAL;
goto out;
}
@@ -797,20 +802,20 @@ static int __init zram_init(void)
goto out;
}
- if (!zram_num_devices) {
+ if (!num_devices) {
pr_info("num_devices not specified. Using default: 1\n");
- zram_num_devices = 1;
+ num_devices = 1;
}
/* Allocate the device array and initialize each one */
- pr_info("Creating %u devices ...\n", zram_num_devices);
- zram_devices = kzalloc(zram_num_devices * sizeof(struct zram), GFP_KERNEL);
+ pr_info("Creating %u devices ...\n", num_devices);
+ zram_devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL);
if (!zram_devices) {
ret = -ENOMEM;
goto unregister;
}
- for (dev_id = 0; dev_id < zram_num_devices; dev_id++) {
+ for (dev_id = 0; dev_id < num_devices; dev_id++) {
ret = create_device(&zram_devices[dev_id], dev_id);
if (ret)
goto free_devices;
@@ -833,7 +838,7 @@ static void __exit zram_exit(void)
int i;
struct zram *zram;
- for (i = 0; i < zram_num_devices; i++) {
+ for (i = 0; i < num_devices; i++) {
zram = &zram_devices[i];
destroy_device(zram);
@@ -847,8 +852,8 @@ static void __exit zram_exit(void)
pr_debug("Cleanup done!\n");
}
-module_param(zram_num_devices, uint, 0);
-MODULE_PARM_DESC(zram_num_devices, "Number of zram devices");
+module_param(num_devices, uint, 0);
+MODULE_PARM_DESC(num_devices, "Number of zram devices");
module_init(zram_init);
module_exit(zram_exit);
diff --git a/drivers/staging/zram/zram_drv.h b/drivers/staging/zram/zram_drv.h
index 572faa8..fbe8ac9 100644
--- a/drivers/staging/zram/zram_drv.h
+++ b/drivers/staging/zram/zram_drv.h
@@ -124,7 +124,7 @@ struct zram {
};
extern struct zram *zram_devices;
-extern unsigned int zram_num_devices;
+unsigned int zram_get_num_devices(void);
#ifdef CONFIG_SYSFS
extern struct attribute_group zram_disk_attr_group;
#endif
diff --git a/drivers/staging/zram/zram_sysfs.c b/drivers/staging/zram/zram_sysfs.c
index d2875c5..a7f3771 100644
--- a/drivers/staging/zram/zram_sysfs.c
+++ b/drivers/staging/zram/zram_sysfs.c
@@ -34,7 +34,7 @@ static struct zram *dev_to_zram(struct device *dev)
int i;
struct zram *zram = NULL;
- for (i = 0; i < zram_num_devices; i++) {
+ for (i = 0; i < zram_get_num_devices(); i++) {
zram = &zram_devices[i];
if (disk_to_dev(zram->disk) == dev)
break;
--
1.7.7.6
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