The following commit has been merged into the locking/debug branch of tip: Commit-ID: eb32f9f990d974a7878a8792cee9bb821720c24b Gitweb: https://git.kernel.org/tip/eb32f9f990d974a7878a8792cee9bb821720c24b Author: Marco Elver <elver@xxxxxxxxxx> AuthorDate: Mon, 07 Jun 2021 14:56:47 +02:00 Committer: Paul E. McKenney <paulmck@xxxxxxxxxx> 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 <mark.rutland@xxxxxxx> Signed-off-by: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx> --- 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 if KCSAN -# Compiler capabilities that should not fail the test if they are unavailable. config CC_HAS_TSAN_COMPOUND_READ_BEFORE_WRITE 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. config KCSAN_VERBOSE 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. config KCSAN_REPORT_RACE_UNKNOWN_ORIGIN bool "Report races of unknown origin"
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