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* [tip: locking/debug] kcsan: Improve some Kconfig comments
@ 2021-08-18  7:58 tip-bot2 for Marco Elver
  0 siblings, 0 replies; only message in thread
From: tip-bot2 for Marco Elver @ 2021-08-18  7:58 UTC (permalink / raw)
  To: linux-tip-commits
  Cc: Mark Rutland, Marco Elver, Paul E. McKenney, x86, linux-kernel

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

Commit-ID:     eb32f9f990d974a7878a8792cee9bb821720c24b
Author:        Marco Elver <>
AuthorDate:    Mon, 07 Jun 2021 14:56:47 +02:00
Committer:     Paul E. McKenney <>
CommitterDate: Tue, 20 Jul 2021 13:49:43 -07:00

kcsan: Improve some Kconfig comments

Improve comment for CC_HAS_TSAN_COMPOUND_READ_BEFORE_WRITE. Also shorten
the comment above the "strictness" configuration options.

Acked-by: Mark Rutland <>
Signed-off-by: Marco Elver <>
Signed-off-by: Paul E. McKenney <>
 lib/Kconfig.kcsan | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan
index 0440f37..6152fbd 100644
--- a/lib/Kconfig.kcsan
+++ b/lib/Kconfig.kcsan
@@ -40,10 +40,14 @@ menuconfig KCSAN
-# Compiler capabilities that should not fail the test if they are unavailable.
 	def_bool (CC_IS_CLANG && $(cc-option,-fsanitize=thread -mllvm -tsan-compound-read-before-write=1)) || \
 		 (CC_IS_GCC && $(cc-option,-fsanitize=thread --param tsan-compound-read-before-write=1))
+	help
+	  The compiler instruments plain compound read-write operations
+	  differently (++, --, +=, -=, |=, &=, etc.), which allows KCSAN to
+	  distinguish them from other plain accesses. This is currently
+	  supported by Clang 12 or later.
 	bool "Show verbose reports with more information about system state"
@@ -169,13 +173,9 @@ config KCSAN_REPORT_ONCE_IN_MS
 	  reporting to avoid flooding the console with reports.  Setting this
 	  to 0 disables rate limiting.
-# The main purpose of the below options is to control reported data races (e.g.
-# in fuzzer configs), and are not expected to be switched frequently by other
-# users. We could turn some of them into boot parameters, but given they should
-# not be switched normally, let's keep them here to simplify configuration.
-# The defaults below are chosen to be very conservative, and may miss certain
-# bugs.
+# The main purpose of the below options is to control reported data races, and
+# are not expected to be switched frequently by non-testers or at runtime.
+# The defaults are chosen to be conservative, and can miss certain bugs.
 	bool "Report races of unknown origin"

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