From 3a88d7c5c9448d24785ce862334bde2d5dc39aca Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Tue, 12 May 2020 12:45:40 +0100 Subject: [PATCH] arm64: kconfig: Update and comment GCC version check for kernel BTI Some versions of GCC are known to suffer from a BTI code generation bug, meaning that CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI cannot be solely used to determine whether or not we can compile with kernel with BTI enabled. Update the BTI Kconfig entry to refer to the relevant GCC bugzilla entry (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697) and update the check now that the fix has been merged into GCC release 10.1. Acked-by: Mark Brown Signed-off-by: Will Deacon --- arch/arm64/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 77d5fa96f9d0..e058854bcefc 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1616,7 +1616,8 @@ config ARM64_BTI_KERNEL depends on ARM64_BTI depends on ARM64_PTR_AUTH depends on CC_HAS_BRANCH_PROT_PAC_RET_BTI - depends on !CC_IS_GCC || GCC_VERSION >= 100000 + # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94697 + depends on !CC_IS_GCC || GCC_VERSION >= 100100 depends on !(CC_IS_CLANG && GCOV_KERNEL) depends on (!FUNCTION_GRAPH_TRACER || DYNAMIC_FTRACE_WITH_REGS) help -- GitLab