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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Khem Raj <raj.khem@gmail.com>,
	Nathan Chancellor <nathan@kernel.org>,
	Palmer Dabbelt <palmerdabbelt@google.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-riscv@lists.infradead.org
Subject: [PATCH AUTOSEL 5.12 26/49] riscv: Use -mno-relax when using lld linker
Date: Mon,  7 Jun 2021 12:11:52 -0400	[thread overview]
Message-ID: <20210607161215.3583176-26-sashal@kernel.org> (raw)
In-Reply-To: <20210607161215.3583176-1-sashal@kernel.org>

From: Khem Raj <raj.khem@gmail.com>

[ 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>
---
 arch/riscv/Makefile | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 1368d943f1f3..5243bf2327c0 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -38,6 +38,15 @@ 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
-- 
2.30.2


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           reply	other threads:[~2021-06-07 16:13 UTC|newest]

Thread overview: expand[flat|nested]  mbox.gz  Atom feed
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