Commit 27787930 authored by Marco Elver's avatar Marco Elver Committed by Paul E. McKenney
Browse files

kcsan: Show message if enabled early 



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

Signed-off-by: default avatarMarco Elver <elver@google.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 4700ccdf

kernel/kcsan/core.c

+6 −2
Original line number Diff line number Diff line 
// 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));
@@ -623,9 +625,11 @@ 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 =================================================== */