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From: Marco Elver <elver@google.com>
To: elver@google.com, paulmck@kernel.org
Cc: boqun.feng@gmail.com, mark.rutland@arm.com, will@kernel.org,
	glider@google.com, dvyukov@google.com,
	kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org
Subject: [PATCH 6/7] kcsan: Print if strict or non-strict during init
Date: Mon,  7 Jun 2021 14:56:52 +0200	[thread overview]
Message-ID: <20210607125653.1388091-7-elver@google.com> (raw)
In-Reply-To: <20210607125653.1388091-1-elver@google.com>

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>
---
 kernel/kcsan/core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/kcsan/core.c b/kernel/kcsan/core.c
index 439edb9dcbb1..76e67d1e02d4 100644
--- a/kernel/kcsan/core.c
+++ b/kernel/kcsan/core.c
@@ -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 =================================================== */
-- 
2.32.0.rc1.229.g3e70b5a671-goog


  parent reply	other threads:[~2021-06-07 12:57 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-07 12:56 [PATCH 0/7] kcsan: Introduce CONFIG_KCSAN_PERMISSIVE Marco Elver
2021-06-07 12:56 ` [PATCH 1/7] kcsan: Improve some Kconfig comments Marco Elver
2021-06-07 12:56 ` [PATCH 2/7] kcsan: Remove CONFIG_KCSAN_DEBUG Marco Elver
2021-06-07 12:56 ` [PATCH 3/7] kcsan: Introduce CONFIG_KCSAN_STRICT Marco Elver
2021-06-07 12:56 ` [PATCH 4/7] kcsan: Reduce get_ctx() uses in kcsan_found_watchpoint() Marco Elver
2021-06-07 12:56 ` [PATCH 5/7] kcsan: Rework atomic.h into permissive.h Marco Elver
2021-06-07 12:56 ` Marco Elver [this message]
2021-06-07 12:56 ` [PATCH 7/7] kcsan: permissive: Ignore data-racy 1-bit value changes Marco Elver
2021-06-09 12:38 ` [PATCH 0/7] kcsan: Introduce CONFIG_KCSAN_PERMISSIVE Mark Rutland
2021-06-09 14:48   ` Marco Elver
2021-06-15 18:19   ` Paul E. McKenney
2021-06-15 18:51     ` Marco Elver
2021-06-15 20:39       ` Paul E. McKenney

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