Unverified Commit bb58e157 authored Mar 26, 2025 by Palmer Dabbelt

RISC-V: errata: Use medany for relocatable builds

We're trying to mix non-PIC/PIE objects into the otherwise-PIE
relocatable kernels, to avoid GOT/PLT references during early boot
alternative resolution (which happens before the GOT/PLT are set up).

riscv64-unknown-linux-gnu-ld: arch/riscv/errata/sifive/errata.o: relocation R_RISCV_HI20 against `tlb_flush_all_threshold' can not be used when making a shared object; recompile with -fPIC
riscv64-unknown-linux-gnu-ld: arch/riscv/errata/thead/errata.o: relocation R_RISCV_HI20 against `riscv_cbom_block_size' can not be used when making a shared object; recompile with -fPIC

Fixes: 8dc2a7e8 ("riscv: Fix relocatable kernels with early alternatives using -fno-pie")
Link: https://lore.kernel.org/r/20250326224506.27165-2-palmer@rivosinc.com

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

parent 2014c95a

arch/riscv/errata/Makefile

+5 −1

Original line number	Diff line number	Diff line
		ifdef CONFIG_RELOCATABLE
		KBUILD_CFLAGS += -fno-pie
		# We can't use PIC/PIE when handling early-boot errata parsing, as the kernel
		# doesn't have a GOT setup at that point. So instead just use medany: it's
		# usually position-independent, so it should be good enough for the errata
		# handling.
		KBUILD_CFLAGS += -fno-pie -mcmodel=medany
		endif

		ifdef CONFIG_RISCV_ALTERNATIVE_EARLY