zram: add support for mem_limit

Some targets might be interested in limiting how big
zram can grow. If the variable is set in /etc/default/zram file,
configure it in mem_limit sysfs attribute.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/meta-oe/recipes-extended/zram/zram/zram-swap-init b/meta-oe/recipes-extended/zram/zram/zram-swap-init
index ccc3aafe3..28082f7ff 100755
--- a/meta-oe/recipes-extended/zram/zram/zram-swap-init
+++ b/meta-oe/recipes-extended/zram/zram/zram-swap-init
@@ -24,3 +24,8 @@ modprobe -q zram || true
 
 zramctl -a ${ZRAM_ALGORITHM} -s ${memzram}KB $device
 mkswap -L "zram-swap" $device
+
+devname="${device##*/}"
+if [ ! -z ${ZRAM_SIZE_LIMIT+x} ]; then
+        echo ${ZRAM_SIZE_LIMIT} > /sys/block/$devname/mem_limit
+fi