make-newer-binutils-work.patch

inspired by: https://lore.kernel.org/lkml/20220126171442.1338740-1-aurelien@aurel32.net/T/

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 0eb4568fbd29..c18d87212177 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -52,6 +52,12 @@ riscv-march-$(CONFIG_ARCH_RV32I)	:= rv32ima
 riscv-march-$(CONFIG_ARCH_RV64I)	:= rv64ima
 riscv-march-$(CONFIG_FPU)		:= $(riscv-march-y)fd
 riscv-march-$(CONFIG_RISCV_ISA_C)	:= $(riscv-march-y)c
+
+# Newer binutils versions default to ISA spec version 20191213 which moves some
+# instructions from the I extension to the Zicsr and Zifencei extensions.
+toolchain-need-zicsr-zifencei := $(call cc-option-yn, -march=$(riscv-march-y)_zicsr_zifencei)
+riscv-march-$(toolchain-need-zicsr-zifencei) := $(riscv-march-y)_zicsr_zifencei
+
 KBUILD_CFLAGS += -march=$(subst fd,,$(riscv-march-y))
 KBUILD_AFLAGS += -march=$(riscv-march-y)