[tip: locking/debug] kcsan: Make strict mode imply interruptible watchers

[tip-bot2 for Marco Elver]

The following commit has been merged into the locking/debug branch of tip:

Commit-ID:     e04938042d77addc7f41d983aebea125cddbed33
Gitweb:        https://git.kernel.org/tip/e04938042d77addc7f41d983aebea125cddbed33
Author:        Marco Elver <elver@xxxxxxxxxx>
AuthorDate:    Tue, 15 Jun 2021 20:39:38 +02:00
Committer:     Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Tue, 20 Jul 2021 13:49:44 -07:00

kcsan: Make strict mode imply interruptible watchers

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

diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index 26f03c7..e0a93ff 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