arm64: vdso32: make vdso32 install conditional

commit 5d28ba5f8a0cfa3a874fa96c33731b8fcd141b3a upstream.

vdso32 should only be installed if CONFIG_COMPAT_VDSO is enabled,
since it's not even supposed to be compiled otherwise, and arm64
builds without a 32bit crosscompiler will fail.

Fixes: 8d75785a8142 ("ARM64: vdso32: Install vdso32 from vdso_install")
Signed-off-by: Frank van der Linden <fllinden@amazon.com>
Cc: stable@vger.kernel.org [5.4+]
Link: https://lore.kernel.org/r/20200827234012.19757-1-fllinden@amazon.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 91e377770a6b845f54984e0a8ba3b600d4cf49c1..d5fe7c9e0be1dee8f479fc3b6c69a7c0faef1425 100644 (file)
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -158,7 +158,8 @@ zinstall install:
 PHONY += vdso_install
 vdso_install:
        $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
-       $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@
+       $(if $(CONFIG_COMPAT_VDSO), \
+               $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
 
 # We use MRPROPER_FILES and CLEAN_FILES now
 archclean: