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staging: zram: Rename module parameter 

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@vflare.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nitin Gupta 2012-02-12 23:04:45 -05:00 committed by Greg Kroah-Hartman
parent 7042122fe5
commit 5fa5a90116
3 changed files with 18 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/staging/zram/zram_drv.c
View File

@ -40,7 +40,7 @@ static int zram_major;
struct zram *zram_devices; struct zram *zram_devices;
/* Module params (documentation at end) */ /* Module params (documentation at end) */
unsigned int zram_num_devices; static unsigned int num_devices;
static void zram_stat_inc(u32 *v) static void zram_stat_inc(u32 *v)
{ {
@ -779,13 +779,18 @@ static void destroy_device(struct zram *zram)
blk_cleanup_queue(zram->queue); blk_cleanup_queue(zram->queue);
} }
unsigned int zram_get_num_devices(void)
{
return num_devices;
}
static int __init zram_init(void) static int __init zram_init(void)
{ {
int ret, dev_id; 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", pr_warning("Invalid value for num_devices: %u\n",
zram_num_devices); num_devices);
ret = -EINVAL; ret = -EINVAL;
goto out; goto out;
} }
@ -797,20 +802,20 @@ static int __init zram_init(void)
goto out; goto out;
} }
if (!zram_num_devices) { if (!num_devices) {
pr_info("num_devices not specified. Using default: 1\n"); 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 */ /* Allocate the device array and initialize each one */
pr_info("Creating %u devices ...\n", zram_num_devices); pr_info("Creating %u devices ...\n", num_devices);
zram_devices = kzalloc(zram_num_devices * sizeof(struct zram), GFP_KERNEL); zram_devices = kzalloc(num_devices * sizeof(struct zram), GFP_KERNEL);
if (!zram_devices) { if (!zram_devices) {
ret = -ENOMEM; ret = -ENOMEM;
goto unregister; 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); ret = create_device(&zram_devices[dev_id], dev_id);
if (ret) if (ret)
goto free_devices; goto free_devices;
@ -833,7 +838,7 @@ static void __exit zram_exit(void)
int i; int i;
struct zram *zram; struct zram *zram;
for (i = 0; i < zram_num_devices; i++) { for (i = 0; i < num_devices; i++) {
zram = &zram_devices[i]; zram = &zram_devices[i];
destroy_device(zram); destroy_device(zram);
@ -847,8 +852,8 @@ static void __exit zram_exit(void)
pr_debug("Cleanup done!\n"); pr_debug("Cleanup done!\n");
} }
module_param(zram_num_devices, uint, 0); module_param(num_devices, uint, 0);
MODULE_PARM_DESC(zram_num_devices, "Number of zram devices"); MODULE_PARM_DESC(num_devices, "Number of zram devices");
module_init(zram_init); module_init(zram_init);
module_exit(zram_exit); module_exit(zram_exit);

2
drivers/staging/zram/zram_drv.h
View File

@ -124,7 +124,7 @@ struct zram {
}; };
extern struct zram *zram_devices; extern struct zram *zram_devices;
extern unsigned int zram_num_devices; unsigned int zram_get_num_devices(void);
#ifdef CONFIG_SYSFS #ifdef CONFIG_SYSFS
extern struct attribute_group zram_disk_attr_group; extern struct attribute_group zram_disk_attr_group;
#endif #endif

2
drivers/staging/zram/zram_sysfs.c
View File

@ -34,7 +34,7 @@ static struct zram *dev_to_zram(struct device *dev)
int i; int i;
struct zram *zram = NULL; 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]; zram = &zram_devices[i];
if (disk_to_dev(zram->disk) == dev) if (disk_to_dev(zram->disk) == dev)
break; break;