kcsan: Show message if enabled early

Show a message in the kernel log if KCSAN was enabled early.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
index 99e5044..b176400 100644 (file)
--- a/kernel/kcsan/core.c
+++ b/kernel/kcsan/core.c
@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
+#define pr_fmt(fmt) "kcsan: " fmt
+
 #include <linux/atomic.h>
 #include <linux/bug.h>
 #include <linux/delay.h>
@@ -463,7 +465,7 @@ kcsan_setup_watchpoint(const volatile void *ptr, size_t size, int type)
 
        if (IS_ENABLED(CONFIG_KCSAN_DEBUG)) {
                kcsan_disable_current();
-               pr_err("KCSAN: watching %s, size: %zu, addr: %px [slot: %d, encoded: %lx]\n",
+               pr_err("watching %s, size: %zu, addr: %px [slot: %d, encoded: %lx]\n",
                       is_write ? "write" : "read", size, ptr,
                       watchpoint_slot((unsigned long)ptr),
                       encode_watchpoint((unsigned long)ptr, size, is_write));
@@ -623,8 +625,10 @@ void __init kcsan_init(void)
         * We are in the init task, and no other tasks should be running;
         * WRITE_ONCE without memory barrier is sufficient.
         */
-       if (kcsan_early_enable)
+       if (kcsan_early_enable) {
+               pr_info("enabled early\n");
                WRITE_ONCE(kcsan_enabled, true);
+       }
 }
 
 /* === Exported interface =================================================== */