linux-kernel - [PATCH 5.8 199/255] arm64: vdso32: make vdso32 install conditional

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Date:   Tue,  1 Sep 2020 17:10:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Frank van der Linden <fllinden@...zon.com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH 5.8 199/255] arm64: vdso32: make vdso32 install conditional

From: Frank van der Linden <fllinden@...zon.com>

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@...zon.com>
Cc: stable@...r.kernel.org [5.4+]
Link: https://lore.kernel.org/r/20200827234012.19757-1-fllinden@amazon.com
Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/Makefile |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 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: