riscv: Use -mno-relax when using lld linker

[ Upstream commit ec3a5cb61146c91f0f7dcec8b7e7157a4879a9ee ]

lld does not implement the RISCV relaxation optimizations like GNU ld
therefore disable it when building with lld, Also pass it to
assembler when using external GNU assembler ( LLVM_IAS != 1 ), this
ensures that relevant assembler option is also enabled along. if these
options are not used then we see following relocations in objects

0000000000000000 R_RISCV_ALIGN     *ABS*+0x0000000000000002

These are then rejected by lld
ld.lld: error: capability.c:(.fixup+0x0): relocation R_RISCV_ALIGN requires unimplemented linker relaxation; recompile with -mno-relax but the .o is already compiled with -mno-relax

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index f5e91421024546fd0498142c382aebccbd9ff321..1cbe0ad78b0f3fdf006ca604ed782db1a1f63331 100644 (file)
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -34,6 +34,15 @@ else
        KBUILD_LDFLAGS += -melf32lriscv
 endif
 
+ifeq ($(CONFIG_LD_IS_LLD),y)
+       KBUILD_CFLAGS += -mno-relax
+       KBUILD_AFLAGS += -mno-relax
+ifneq ($(LLVM_IAS),1)
+       KBUILD_CFLAGS += -Wa,-mno-relax
+       KBUILD_AFLAGS += -Wa,-mno-relax
+endif
+endif
+
 # ISA string setting
 riscv-march-$(CONFIG_ARCH_RV32I)       := rv32ima
 riscv-march-$(CONFIG_ARCH_RV64I)       := rv64ima