It's confusing when we disable zswap while zswap is init failed or has no
pool. If no change required, just return directly.
Signed-off-by: Liu Shixin <liushixin2@xxxxxxxxxx>
---
mm/zswap.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/mm/zswap.c b/mm/zswap.c
index 4c476c463035..ef7463550e49 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -886,6 +886,15 @@ static int zswap_zpool_param_set(const char *val,
static int zswap_enabled_param_set(const char *val,
const struct kernel_param *kp)
{
+ bool res;
+
+ if (kstrtobool(val, &res))
+ return -EINVAL;
+
+ /* no change required */
+ if (res == *(bool *)kp->arg)
+ return 0;
+
if (system_state == SYSTEM_RUNNING) {
mutex_lock(&zswap_init_lock);
if (zswap_setup()) {
--
2.25.1
