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

Jackie Liu
2022-05-18T00:52:14Z

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