arm64: makefile fix build of .i file in external module case
[ Upstream commit 98356eb0ae499c63e78073ccedd9a5fc5c563288 ] After 'a66649da arm64: fix vdso-offsets.h dependency' if one will try to build .i file in case of external kernel module, build fails complaining that prepare0 target is missing. This issue came up with SystemTap when it tries to build variety of .i files for its own generated kernel modules trying to figure given kernel features/capabilities. The issue is that prepare0 is defined in top level Makefile only if KBUILD_EXTMOD is not defined. .i file rule depends on prepare and in case KBUILD_EXTMOD defined top level Makefile contains empty rule for prepare. But after mentioned commit arch/arm64/Makefile would introduce dependency on prepare0 through its own prepare target. Fix it to put proper ifdef KBUILD_EXTMOD around code introduced by mentioned commit. It matches what top level Makefile does. Acked-by: NKevin Brodsky <kevin.brodsky@arm.com> Signed-off-by: NVictor Kamensky <kamensky@cisco.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NSasha Levin <sashal@kernel.org>
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