kcsan: Clean up the main KCSAN Kconfig option

This patch cleans up the rules of the 'KCSAN' Kconfig option by:

  1. implicitly selecting 'STACKTRACE' instead of depending on it;
  2. depending on DEBUG_KERNEL, to avoid accidentally turning KCSAN on if
     the kernel is not meant to be a debug kernel;
  3. updating the short and long summaries.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index 020ac63..9785bbf 100644 (file)
--- a/lib/Kconfig.kcsan
+++ b/lib/Kconfig.kcsan
@@ -4,12 +4,15 @@ config HAVE_ARCH_KCSAN
        bool
 
 menuconfig KCSAN
-       bool "KCSAN: watchpoint-based dynamic data race detector"
-       depends on HAVE_ARCH_KCSAN && !KASAN && STACKTRACE
+       bool "KCSAN: dynamic data race detector"
+       depends on HAVE_ARCH_KCSAN && DEBUG_KERNEL && !KASAN
+       select STACKTRACE
        help
-         Kernel Concurrency Sanitizer is a dynamic data race detector, which
-         uses a watchpoint-based sampling approach to detect races. See
-         <file:Documentation/dev-tools/kcsan.rst> for more details.
+         The Kernel Concurrency Sanitizer (KCSAN) is a dynamic data race
+         detector, which relies on compile-time instrumentation, and uses a
+         watchpoint-based sampling approach to detect data races.
+
+         See <file:Documentation/dev-tools/kcsan.rst> for more details.
 
 if KCSAN