[PATCH v2] mm/kfence: print disabling or re-enabling message

[Jackie Liu <liu.yun@linux.dev>]

From: Jackie Liu <liuyun01@kylinos.cn>

By printing information, we can friendly prompt the status change
information of kfence by dmesg and record by syslog.

Co-developed-by: Marco Elver <elver@google.com>
Signed-off-by: Jackie Liu <liuyun01@kylinos.cn>
---
 v1->v2:
   fixup by Marco Elver <elver@google.com>

 mm/kfence/core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/mm/kfence/core.c b/mm/kfence/core.c
index 11a954763be9..de5bcf2609fe 100644
--- a/mm/kfence/core.c
+++ b/mm/kfence/core.c
@@ -67,8 +67,12 @@ static int param_set_sample_interval(const char *val, const struct kernel_param
 	if (ret < 0)
 		return ret;
 
-	if (!num) /* Using 0 to indicate KFENCE is disabled. */
+	/* Using 0 to indicate KFENCE is disabled. */
+	if (!num) {
+		if (READ_ONCE(kfence_enabled))
+			pr_info("disabled\n");
 		WRITE_ONCE(kfence_enabled, false);
+	}
 
 	*((unsigned long *)kp->arg) = num;
 
@@ -874,6 +878,7 @@ static int kfence_enable_late(void)
 
 	WRITE_ONCE(kfence_enabled, true);
 	queue_delayed_work(system_unbound_wq, &kfence_timer, 0);
+	pr_info("re-enabled\n");
 	return 0;
 }
 
-- 
2.25.1