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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>
This commit is contained in:
Marco Elver 2020-07-31 10:17:22 +02:00 committed by Paul E. McKenney
parent 4700ccdf18
commit 2778793072
1 changed files with 6 additions and 2 deletions
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8
kernel/kcsan/core.c
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@ -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 =================================================== */