RISC-V Fixes for 5.16-rc2

I have two patches for 5.16:
 
 * A fix that allows external modules to be built against read-only
   source trees.
 * A patch to turn KVM on in the defconfigs.
 
 The second one isn't technically a fix, but it got tied up pending some
 defconfig cleanups that ended up finding some larger issues.  I figured
 it'd be better to get the config changes some more testing, but didn't
 want to hold up turning KVM on for that.
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Merge tag 'riscv-for-linus-5.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:
 "I have two patches for 5.16:

   - allow external modules to be built against read-only source trees

   - turn KVM on in the defconfigs

  The second one isn't technically a fix, but it got tied up pending
  some defconfig cleanups that ended up finding some larger issues. I
  figured it'd be better to get the config changes some more testing,
  but didn't want to hold up turning KVM on for that"

* tag 'riscv-for-linus-5.16-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: fix building external modules
  RISC-V: Enable KVM in RV64 and RV32 defconfigs as a module

arch/riscv/Makefile

@@ -107,11 +107,13 @@ PHONY += vdso_install
 vdso_install:
 	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 
+ifeq ($(KBUILD_EXTMOD),)
 ifeq ($(CONFIG_MMU),y)
 prepare: vdso_prepare
 vdso_prepare: prepare0
 	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso include/generated/vdso-offsets.h
 endif
+endif
 
 ifneq ($(CONFIG_XIP_KERNEL),y)
 ifeq ($(CONFIG_RISCV_M_MODE)$(CONFIG_SOC_CANAAN),yy)

arch/riscv/configs/defconfig

@@ -19,6 +19,8 @@ CONFIG_SOC_VIRT=y
 CONFIG_SOC_MICROCHIP_POLARFIRE=y
 CONFIG_SMP=y
 CONFIG_HOTPLUG_CPU=y
+CONFIG_VIRTUALIZATION=y
+CONFIG_KVM=m
 CONFIG_JUMP_LABEL=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y

arch/riscv/configs/rv32_defconfig

@@ -19,6 +19,8 @@ CONFIG_SOC_VIRT=y
 CONFIG_ARCH_RV32I=y
 CONFIG_SMP=y
 CONFIG_HOTPLUG_CPU=y
+CONFIG_VIRTUALIZATION=y
+CONFIG_KVM=m
 CONFIG_JUMP_LABEL=y
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y