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@vger.kernel.org
Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202506290255.KBVM83vZ-lkp@intel.com/
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20250710-riscv-restrict-lto-to-medany-v1-1-b1dac9871ecf@kernel.org
Signed-off-by: Paul Walmsley <pjw@kernel.org>

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index a4b233a0659ed80c0eb6b118ea8c8db81ed3fdba..51dcd8eaa24356d947ebe0f1c4a701a3cfc6b757 100644 (file)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -65,7 +65,7 @@ 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