[PATCH] arm64: makefile fix build of .i file in external module case

[kamensky@cisco.com (Victor Kamensky)]

After 'a66649dab350 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.

Signed-off-by: Victor Kamensky <kamensky@cisco.com>
---
Test to reproduce the issue:

[kamensky at kamensky-w541 m]$ cat hello.c 
#include <linux/module.h>
#include <linux/printk.h>

int
init_module (void)
{
    printk(KERN_DEBUG "Hello, world\n");
    return 0;
}

void
cleanup_module(void)
{
    printk(KERN_ERR "Bye, got unloaded\n");
}

MODULE_LICENSE("GPL");
[kamensky at kamensky-w541 m]$ cat Makefile 
obj-m := hello.o
[kamensky at kamensky-w541 m]$ make -C /home/kamensky/linux M=`pwd`
make: Entering directory '/home/kamensky/linux'
  CC [M]  /home/kamensky/m/hello.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/kamensky/m/hello.mod.o
  LD [M]  /home/kamensky/m/hello.ko
make: Leaving directory '/home/kamensky/linux'
[kamensky at kamensky-w541 m]$ make -C /home/kamensky/linux M=`pwd` hello.i
make: Entering directory '/home/kamensky/linux'
make: *** No rule to make target 'prepare0', needed by 'vdso_prepare'.  Stop.
make: Leaving directory '/home/kamensky/linux'
[kamensky at kamensky-w541 m]$ 

After the fix:

[kamensky at kamensky-w541 m]$ make -C /home/kamensky/linux M=`pwd` hello.i
make: Entering directory '/home/kamensky/linux'
  CPP [M] /home/kamensky/m/hello.i
make: Leaving directory '/home/kamensky/linux'
[kamensky at kamensky-w541 m]

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

diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 106039d25e2f..3016ccb41468 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -147,6 +147,7 @@ archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)
 	$(Q)$(MAKE) $(clean)=$(boot)/dts
 
+ifeq ($(KBUILD_EXTMOD),)
 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 # In order to do that, we should use the archprepare target, but we can't since
 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
@@ -156,6 +157,7 @@ archclean:
 prepare: vdso_prepare
 vdso_prepare: prepare0
 	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
+endif
 
 define archhelp
   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
-- 
2.17.2