Unverified Commit 5ff8c117 authored by Nathan Chancellor's avatar Nathan Chancellor
Browse files

KMSAN: Remove tautological checks 



Now that the minimum supported version of LLVM for building the kernel
has been bumped to 15.0.0, two KMSAN checks can be cleaned up.

CONFIG_HAVE_KMSAN_COMPILER will always be true when using clang so
remove the cc-option test and use a simple check for CONFIG_CC_IS_CLANG.

CONFIG_HAVE_KMSAN_PARAM_RETVAL will always be true so it can be removed
outright.

Acked-by: default avatarMarco Elver <elver@google.com>
Reviewed-by: default avatarKees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/20250821-bump-min-llvm-ver-15-v2-12-635f3294e5f0@kernel.org


Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
parent 573ad421

lib/Kconfig.kmsan

+1 −10
Original line number Diff line number Diff line
@@ -3,10 +3,7 @@ config HAVE_ARCH_KMSAN 
	bool



config HAVE_KMSAN_COMPILER

	# Clang versions <14.0.0 also support -fsanitize=kernel-memory, but not

	# all the features necessary to build the kernel with KMSAN.

	depends on CC_IS_CLANG && CLANG_VERSION >= 140000

	def_bool $(cc-option,-fsanitize=kernel-memory -mllvm -msan-disable-checks=1)

	def_bool CC_IS_CLANG



config KMSAN

	bool "KMSAN: detector of uninitialized values use"
@@ -28,15 +25,9 @@ config KMSAN 


if KMSAN



config HAVE_KMSAN_PARAM_RETVAL

	# -fsanitize-memory-param-retval is supported only by Clang >= 14.

	depends on HAVE_KMSAN_COMPILER

	def_bool $(cc-option,-fsanitize=kernel-memory -fsanitize-memory-param-retval)



config KMSAN_CHECK_PARAM_RETVAL

	bool "Check for uninitialized values passed to and returned from functions"

	default y

	depends on HAVE_KMSAN_PARAM_RETVAL

	help

	  If the compiler supports -fsanitize-memory-param-retval, KMSAN will

	  eagerly check every function parameter passed by value and every