[PATCH] Make KVM compile on split source/object kernel configurations

[Alexander Graf <agraf@suse.de>]

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KVM as is assumes that the kernel obj dir and the kernel source dir are 
at the same location. This is true for most self-built vanilla kernels, 
but some distributions split these up (e.g. SUSE).
To keep compatible and have users have a good experience on building KVM 
on any distribution, this patch attempts to rebuild the logic from the 
kernel Makefile as closely as possible. With it I successfully built KVM 
on a current SUSE system.

Signed-off-by: Alexander Graf <agraf@suse.de>

Please check and see if it breaks the build process for anyone else. 
Building with IA64 on SUSE-kernels is still broken due to similar but 
separate problems.



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diff --git a/configure b/configure
index 3bb10ce..5e9cbab 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,7 @@
 #!/bin/bash
 
 prefix=/usr/local
+kernelsourcedir=
 kerneldir=/lib/modules/$(uname -r)/build
 cc=gcc
 ld=ld
@@ -102,6 +103,11 @@ if [ "$arch" = "powerpc" ]; then
     qemu_ldflags="$qemu_ldflags -L $PWD/libfdt"
 fi
 
+# see if we have split build and source directories
+if [ -d "$kerneldir/include2" ]; then
+    kernelsourcedir=${kerneldir%/*}/source
+fi
+
 #configure user dir
 (cd user; ./configure --prefix="$prefix" --kerneldir="$libkvm_kerneldir" \
           --arch="$arch" \
@@ -124,6 +130,7 @@ cat <<EOF > config.mak
 ARCH=$arch
 PREFIX=$prefix
 KERNELDIR=$kerneldir
+KERNELSOURCEDIR=$kernelsourcedir
 LIBKVM_KERNELDIR=$libkvm_kerneldir
 WANT_MODULE=$want_module
 CROSS_COMPILE=$cross_prefix
diff --git a/kernel/Makefile b/kernel/Makefile
index 3f5f6da..d2cf89c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -36,7 +36,9 @@ hack-files = $(hack-files-$(ARCH_DIR))
 all:: header-link prerequisite
 #	include header priority 1) $LINUX 2) $KERNELDIR 3) include-compat
 	$(MAKE) -C $(KERNELDIR) M=`pwd` \
-		LINUXINCLUDE="-I`pwd`/include -Iinclude -Iarch/${ARCH_DIR}/include -I`pwd`/include-compat \
+		LINUXINCLUDE="-I`pwd`/include -Iinclude \
+		$(if $(KERNELSOURCEDIR),-Iinclude2 -I$(KERNELSOURCEDIR)/include) \
+		-Iarch/${ARCH_DIR}/include -I`pwd`/include-compat \
 		-include include/linux/autoconf.h \
 		-include `pwd`/$(ARCH_DIR)/external-module-compat.h"
 		"$$@"