linux-kernel - [PATCH] riscv: Only allow LTO with CMODEL

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Message-Id: <20250710-riscv-restrict-lto-to-medany-v1-1-b1dac9871ecf@kernel.org>
Date: Thu, 10 Jul 2025 13:25:26 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Palmer Dabbelt <palmer@...belt.com>, Alexandre Ghiti <alex@...ti.fr>
Cc: Conor Dooley <conor@...nel.org>, linux-riscv@...ts.infradead.org, 
 llvm@...ts.linux.dev, linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
 kernel test robot <lkp@...el.com>, Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH] riscv: Only allow LTO with CMODEL_MEDANY

When building with CONFIG_CMODEL_MEDLOW and CONFIG_LTO_CLANG, there is a
series of errors due to some files being unconditionally compiled with
'-mcmodel=medany', mismatching with the rest of the kernel built with
'-mcmodel=medlow':

  ld.lld: error: Function Import: link error: linking module flags 'Code Model': IDs have conflicting values: 'i32 3' from vmlinux.a(init.o at 899908), and 'i32 1' from vmlinux.a(net-traces.o at 1014628)

Only allow LTO to be performed when CONFIG_CMODEL_MEDANY is enabled to
ensure there will be no code model mismatch errors. An alternative
solution would be disabling LTO for the files with a different code
model than the main kernel like some specialized areas of the kernel do
but doing that for individual files is not as sustainable than
forbidding the combination altogether.

Cc: stable@...r.kernel.org
Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202506290255.KBVM83vZ-lkp@intel.com/
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/riscv/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 36061f4732b7..4eee737a050f 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -68,7 +68,7 @@ config RISCV
 	select ARCH_SUPPORTS_HUGE_PFNMAP if TRANSPARENT_HUGEPAGE
 	select ARCH_SUPPORTS_HUGETLBFS if MMU
 	# LLD >= 14: https://github.com/llvm/llvm-project/issues/50505
-	select ARCH_SUPPORTS_LTO_CLANG if LLD_VERSION >= 140000
+	select ARCH_SUPPORTS_LTO_CLANG if LLD_VERSION >= 140000 && CMODEL_MEDANY
 	select ARCH_SUPPORTS_LTO_CLANG_THIN if LLD_VERSION >= 140000
 	select ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS if 64BIT && MMU
 	select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU

---
base-commit: fda589c286040d9ba2d72a0eaf0a13945fc48026
change-id: 20250710-riscv-restrict-lto-to-medany-f1b7dd5c9bba

Best regards,
--  
Nathan Chancellor <nathan@...nel.org>