zram: move zram size warning to documentation

Move zram warning about disksize and size of memory correlation to zram
documentation.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 5 insertions, 15 deletions

diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index 2eccddffa6c8..393541be1ec0 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -33,6 +33,11 @@ Following shows a typical sequence of steps for using zram.
             echo 512M > /sys/block/zram0/disksize
             echo 1G > /sys/block/zram0/disksize
 
+Note:
+There is little point creating a zram of greater than twice the size of memory
+since we expect a 2:1 compression ratio. Note that zram uses about 0.1% of the
+size of the disk when not in use so a huge zram is wasteful.
+
 3) Activate:
         mkswap /dev/zram0
         swapon /dev/zram0
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index c06d7fba4237..21aee3edcb25 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -535,23 +535,8 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity)
 
 static void zram_init_device(struct zram *zram, struct zram_meta *meta)
 {
-        if (zram->disksize > 2 * (totalram_pages << PAGE_SHIFT)) {
-                pr_info(
-                "There is little point creating a zram of greater than "
-                "twice the size of memory since we expect a 2:1 compression "
-                "ratio. Note that zram uses about 0.1%% of the size of "
-                "the disk when not in use so a huge zram is "
-                "wasteful.\n"
-                "\tMemory Size: %lu kB\n"
-                "\tSize you selected: %llu kB\n"
-                "Continuing anyway ...\n",
-                (totalram_pages << PAGE_SHIFT) >> 10, zram->disksize >> 10
-                );
-        }
-
         /* zram devices sort of resembles non-rotational disks */
         queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
-
         zram->meta = meta;
         pr_debug("Initialization done!\n");
 }