Some versions of GNU gold are known to produce broken code with --fix-cortex-a53-843419 as explained in this bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=21491 If ARM64_ERRATUM_843419 is disabled and we're using GNU gold, pass --no-fix-cortex-a53-843419 to the linker to ensure the erratum fix is not used even if the linker is configured to enable it by default. This change also adds a warning if the erratum fix is enabled and gold version <1.14 is used. Signed-off-by: Sami Tolvanen <samitolva...@google.com> --- arch/arm64/Makefile | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 82a0df6e865e..68eed687e468 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -26,8 +26,17 @@ ifeq ($(CONFIG_ARM64_ERRATUM_843419),y) ifeq ($(call ld-option, --fix-cortex-a53-843419),) $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum) else + ifeq ($(call gold-ifversion, -lt, 114000000, y), y) +$(warning This version of GNU gold may generate incorrect code with --fix-cortex-a53-843419;\ + see https://sourceware.org/bugzilla/show_bug.cgi?id=21491) + endif LDFLAGS_vmlinux += --fix-cortex-a53-843419 endif +else + ifeq ($(ld-name),gold) +# Pass --no-fix-cortex-a53-843419 to ensure the erratum fix is disabled +LDFLAGS += --no-fix-cortex-a53-843419 + endif endif KBUILD_DEFCONFIG := defconfig -- 2.15.0.531.g2ccb3012c9-goog
