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RISC-V: errata: Use medany for relocatable builds

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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: 8dc2a7e8027f ("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>
This commit is contained in:
Palmer Dabbelt 2025-03-26 15:45:07 -07:00
parent 2014c95afe
commit bb58e1579f
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1 changed files with 5 additions and 1 deletions
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6
arch/riscv/errata/Makefile
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@ -1,5 +1,9 @@
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