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RISC-V: Fix VDSO build for !MMU

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We don't have a VDSO for the !MMU configurations, so don't try to build
one.

Fixes: fde9c59aeb ("riscv: explicitly use symbol offsets for VDSO")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Palmer Dabbelt 2021-08-25 22:52:45 -07:00
parent 803930ee35
commit a290f510a1
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GPG Key ID: 2E1319F35FBB1889
2 changed files with 11 additions and 0 deletions
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2
arch/riscv/Makefile
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@ -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)

9
arch/riscv/include/asm/vdso.h
View File

@ -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 */