Commit 83d7d04f authored May 18, 2022 by Jackie Liu Committed by Andrew Morton May 25, 2022

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 <liuyun01@kylinos.cn>
Co-developed-by: Marco Elver <elver@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

parent e5c3f619

mm/kfence/core.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}