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authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2015-06-25 15:00:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-25 17:00:36 -0700
commitc3cdb40e66344553898daa3ccd068c03173a3f42 (patch)
tree53fd5157d5958c12a36969b73c298c6ebbeabdd6
parent522698d7cadb5d208429c934f673713b7a42e925 (diff)
downloadop-kernel-dev-c3cdb40e66344553898daa3ccd068c03173a3f42.zip
op-kernel-dev-c3cdb40e66344553898daa3ccd068c03173a3f42.tar.gz
zram: remove max_num_devices limitation
Limiting the number of zram devices to 32 (default max_num_devices value) is confusing, let's drop it. A user with 2TB or 4TB of RAM, for example, can request as many devices as he can handle. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/blockdev/zram.txt4
-rw-r--r--drivers/block/zram/zram_drv.c8
-rw-r--r--drivers/block/zram/zram_drv.h6
3 files changed, 4 insertions, 14 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index bef4998..65e9430 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -19,7 +19,9 @@ Following shows a typical sequence of steps for using zram.
1) Load Module:
modprobe zram num_devices=4
This creates 4 devices: /dev/zram{0,1,2,3}
- (num_devices parameter is optional. Default: 1)
+
+num_devices parameter is optional and tells zram how many devices should be
+pre-created. Default: 1.
2) Set max number of compression streams
Compression backend may use up to max_comp_streams compression streams,
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 82bc2ff..70aac2e 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1287,12 +1287,6 @@ static int __init zram_init(void)
{
int ret, dev_id;
- if (num_devices > max_num_devices) {
- pr_warn("Invalid value for num_devices: %u\n",
- num_devices);
- return -EINVAL;
- }
-
zram_major = register_blkdev(0, "zram");
if (zram_major <= 0) {
pr_warn("Unable to get major number\n");
@@ -1322,7 +1316,7 @@ module_init(zram_init);
module_exit(zram_exit);
module_param(num_devices, uint, 0);
-MODULE_PARM_DESC(num_devices, "Number of zram devices");
+MODULE_PARM_DESC(num_devices, "Number of pre-created zram devices");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Nitin Gupta <ngupta@vflare.org>");
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 570c598..042994e 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -20,12 +20,6 @@
#include "zcomp.h"
-/*
- * Some arbitrary value. This is just to catch
- * invalid value for num_devices module parameter.
- */
-static const unsigned max_num_devices = 32;
-
/*-- Configurable parameters */
/*
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