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kcsan: Print if strict or non-strict during init

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Show a brief message if KCSAN is strict or non-strict, and if non-strict
also say that CONFIG_KCSAN_STRICT=y can be used to see all data races.

This is to hint to users of KCSAN who blindly use the default config
that their configuration might miss data races of interest.

Signed-off-by: Marco Elver <elver@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Marco Elver 2021-06-07 14:56:52 +02:00 committed by Paul E. McKenney
parent 49f72d5358
commit 9c827cd1fc
1 changed files with 9 additions and 0 deletions
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9
kernel/kcsan/core.c
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@ -656,6 +656,15 @@ void __init kcsan_init(void)
pr_info("enabled early\n");
WRITE_ONCE(kcsan_enabled, true);
}
if (IS_ENABLED(CONFIG_KCSAN_REPORT_VALUE_CHANGE_ONLY) ||
IS_ENABLED(CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC) ||
IS_ENABLED(CONFIG_KCSAN_PERMISSIVE) ||
IS_ENABLED(CONFIG_KCSAN_IGNORE_ATOMICS)) {
pr_warn("non-strict mode configured - use CONFIG_KCSAN_STRICT=y to see all data races\n");
} else {
pr_info("strict mode configured\n");
}
}
/* === Exported interface =================================================== */