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