When CONFIG_COMPAT=y the vdso_install target fails:

$ make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- vdso_install
  INSTALL vdso.so
make[1]: *** No rule to make target 'vdso_install'.  Stop.
make: *** [arch/riscv/Makefile:112: vdso_install] Error 2

The problem is that arch/riscv/kernel/compat_vdso/Makefile doesn't
have a vdso_install target, but instead calls it compat_vdso_install.

Signed-off-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
---
 arch/riscv/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 34cf8a598617..5cfbef613e34 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -110,7 +110,7 @@ PHONY += vdso_install
 vdso_install:
 	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
 	$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
-		$(build)=arch/riscv/kernel/compat_vdso $@)
+		$(build)=arch/riscv/kernel/compat_vdso compat_$@)
 
 ifeq ($(KBUILD_EXTMOD),)
 ifeq ($(CONFIG_MMU),y)
-- 
2.36.1

On Sat, 25 Jun 2022 08:42:07 PDT (-0700), emil.renner.berthing@canonical.com wrote:
> When CONFIG_COMPAT=y the vdso_install target fails:
>
> $ make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- vdso_install
>   INSTALL vdso.so
> make[1]: *** No rule to make target 'vdso_install'.  Stop.
> make: *** [arch/riscv/Makefile:112: vdso_install] Error 2
>
> The problem is that arch/riscv/kernel/compat_vdso/Makefile doesn't
> have a vdso_install target, but instead calls it compat_vdso_install.
>
> Signed-off-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
> ---
>  arch/riscv/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> index 34cf8a598617..5cfbef613e34 100644
> --- a/arch/riscv/Makefile
> +++ b/arch/riscv/Makefile
> @@ -110,7 +110,7 @@ PHONY += vdso_install
>  vdso_install:
>  	$(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
>  	$(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
> -		$(build)=arch/riscv/kernel/compat_vdso $@)
> +		$(build)=arch/riscv/kernel/compat_vdso compat_$@)
>
>  ifeq ($(KBUILD_EXTMOD),)
>  ifeq ($(CONFIG_MMU),y)

Sorry for missing this, it's on fixes.