From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Before we can start using register x18 for a special purpose (as permitted by the AAPCS64 ABI), we need to tell the compiler that it is off limits for general allocation. So tag it as 'fixed', and remove the mention from the LL/SC compiler flag override. Link: https://patchwork.kernel.org/patch/9836881/ Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx> --- arch/arm64/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 2c0238ce0551..1c7b276bc7c5 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -55,7 +55,7 @@ endif KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) \ $(compat_vdso) $(cc_has_k_constraint) -KBUILD_CFLAGS += -fno-asynchronous-unwind-tables +KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -ffixed-x18 KBUILD_CFLAGS += $(call cc-disable-warning, psabi) KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) $(compat_vdso) -- 2.23.0.866.gb869b98d4c-goog
