FROMLIST: arm64: explicitly pass --no-fix-cortex-a53-843419 to GNU gold
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.
Bug: 62093296
Bug: 67506682
Change-Id: I5669fa920292adc0fd973035f27dafd4a76d919a
(am from https://patchwork.kernel.org/patch/10085777/)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index c76311c..47e3d7a 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -26,8 +26,17 @@
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