From 51c2ee6d121ceb31ab8d35aff4ce53007aefb455 Mon Sep 17 00:00:00 2001 From: Nick Desaulniers Date: Mon, 21 Jun 2021 16:18:22 -0700 Subject: Kconfig: Introduce ARCH_WANTS_NO_INSTR and CC_HAS_NO_PROFILE_FN_ATTR We don't want compiler instrumentation to touch noinstr functions, which are annotated with the no_profile_instrument_function function attribute. Add a Kconfig test for this and make GCOV depend on it, and in the future, PGO. If an architecture is using noinstr, it should denote that via this Kconfig value. That makes Kconfigs that depend on noinstr able to express dependencies in an architecturally agnostic way. Cc: Masahiro Yamada Link: https://lore.kernel.org/lkml/YMTn9yjuemKFLbws@hirez.programming.kicks-ass.net/ Link: https://lore.kernel.org/lkml/YMcssV%2Fn5IBGv4f0@hirez.programming.kicks-ass.net/ Suggested-by: Nathan Chancellor Suggested-by: Peter Zijlstra Signed-off-by: Nick Desaulniers Reviewed-by: Peter Oberparleiter Reviewed-by: Nathan Chancellor Acked-by: Mark Rutland Acked-by: Heiko Carstens Acked-by: Peter Zijlstra (Intel) Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20210621231822.2848305-4-ndesaulniers@google.com --- arch/Kconfig | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/Kconfig') diff --git a/arch/Kconfig b/arch/Kconfig index c45b770d3579..129df498a8e1 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -285,6 +285,13 @@ config ARCH_THREAD_STACK_ALLOCATOR config ARCH_WANTS_DYNAMIC_TASK_STRUCT bool +config ARCH_WANTS_NO_INSTR + bool + help + An architecture should select this if the noinstr macro is being used on + functions to denote that the toolchain should avoid instrumenting such + functions and is required for correctness. + config ARCH_32BIT_OFF_T bool depends on !64BIT -- cgit v1.2.3