linux-kernel - [PATCH kcsan 8/8] kcsan: Make strict mode imply interruptible watchers

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Date:   Wed, 21 Jul 2021 14:08:12 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
        kernel-team@...com, mingo@...nel.org
Cc:     elver@...gle.com, andreyknvl@...gle.com, glider@...gle.com,
        dvyukov@...gle.com, cai@....pw, boqun.feng@...il.com,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH kcsan 8/8] kcsan: Make strict mode imply interruptible watchers

From: Marco Elver <elver@...gle.com>

If CONFIG_KCSAN_STRICT=y, select CONFIG_KCSAN_INTERRUPT_WATCHER as well.

With interruptible watchers, we'll also report same-CPU data races; if
we requested strict mode, we might as well show these, too.

Suggested-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Marco Elver <elver@...gle.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 lib/Kconfig.kcsan | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index 26f03c754d39b..e0a93ffdef30e 100644
--- a/lib/Kconfig.kcsan
+++ b/lib/Kconfig.kcsan
@@ -150,7 +150,8 @@ config KCSAN_SKIP_WATCH_RANDOMIZE
 	  KCSAN_WATCH_SKIP.
 
 config KCSAN_INTERRUPT_WATCHER
-	bool "Interruptible watchers"
+	bool "Interruptible watchers" if !KCSAN_STRICT
+	default KCSAN_STRICT
 	help
 	  If enabled, a task that set up a watchpoint may be interrupted while
 	  delayed. This option will allow KCSAN to detect races between
-- 
2.31.1.189.g2e36527f23