From 83d7d04f9d2ef354858b2a8444aee38e41ec1699 Mon Sep 17 00:00:00 2001 From: Jackie Liu Date: Wed, 18 May 2022 15:31:05 +0800 Subject: mm/kfence: print disabling or re-enabling message By printing information, we can friendly prompt the status change information of kfence by dmesg and record by syslog. Also, set kfence_enabled to false only when needed. Link: https://lkml.kernel.org/r/20220518073105.3160335-1-liu.yun@linux.dev Signed-off-by: Jackie Liu Co-developed-by: Marco Elver Signed-off-by: Marco Elver Reviewed-by: Marco Elver Signed-off-by: Andrew Morton --- mm/kfence/core.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'mm/kfence') diff --git a/mm/kfence/core.c b/mm/kfence/core.c index 6e69986c3f0d..2b9f89749154 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -69,8 +69,11 @@ 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 && READ_ONCE(kfence_enabled)) { + pr_info("disabled\n"); WRITE_ONCE(kfence_enabled, false); + } *((unsigned long *)kp->arg) = num; @@ -898,6 +901,7 @@ 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; } -- cgit