From: Palmer Dabbelt palmerdabbelt@google.com
[ Upstream commit a290f510a178830a01bfc06e66a54bbe4ece5d2a ]
We don't have a VDSO for the !MMU configurations, so don't try to build one.
Fixes: fde9c59aebaf ("riscv: explicitly use symbol offsets for VDSO") Signed-off-by: Palmer Dabbelt palmerdabbelt@google.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/Makefile | 2 ++ arch/riscv/include/asm/vdso.h | 9 +++++++++ 2 files changed, 11 insertions(+)
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index e026b2d0a5a4..83ee0e71204c 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -108,9 +108,11 @@ PHONY += vdso_install vdso_install: $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
+ifeq ($(CONFIG_MMU),y) prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h +endif
ifneq ($(CONFIG_XIP_KERNEL),y) ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy) diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h index d8d003c2b5a3..893e47195e30 100644 --- a/arch/riscv/include/asm/vdso.h +++ b/arch/riscv/include/asm/vdso.h @@ -8,6 +8,13 @@ #ifndef _ASM_RISCV_VDSO_H #define _ASM_RISCV_VDSO_H
+ +/* + * All systems with an MMU have a VDSO, but systems without an MMU don't + * support shared libraries and therefor don't have one. + */ +#ifdef CONFIG_MMU + #include <linux/types.h> #include <generated/vdso-offsets.h>
@@ -19,6 +26,8 @@ struct vdso_data { #define VDSO_SYMBOL(base, name) \ (void __user *)((unsigned long)(base) + __vdso_##name##_offset)
+#endif /* CONFIG_MMU */ + asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
#endif /* _ASM_RISCV_VDSO_H */