| Message ID | 20200512115458.4985-1-will@kernel.org (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 3a88d7c5c9448d24785ce862334bde2d5dc39aca |
| Headers | show |
| Series | arm64: kconfig: Update and comment GCC version check for kernel BTI | expand |
On Tue, May 12, 2020 at 12:54:58PM +0100, Will Deacon wrote: > 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 <broonie@kernel.org> There wasn't a GCC 10.0 release, I was a little surprised at the numbering of the initial GCC 10 release.
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
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. Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> --- arch/arm64/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)