[OE-core] [PATCH] kernel-devsrc: copy mmiowb.h and modpost from ${B} of kernel

[Hongzhi.Song]

There are two errors when compile an out of tree kernel module
using sdk:

1. "In file included from ./include/linux/seqlock.h:36:0,
                 from ./include/linux/time.h:6,
                 from ./include/linux/stat.h:19,
                 from ./include/linux/module.h:10,
                 from kernel-module/char.c:1:
./include/linux/spinlock.h:60:10: fatal error: asm/mmiowb.h: No such
file or directory"

mmiowb.h is generated to ${B}/arch/${ARCH}/include/generated/asm/.

And there is only generated/ under ${B}/arch/${ARCH}/include/,
so I copy whole ${B}/arch/${ARCH}/include/ to $kerneldir/build/
in case of other files under generated/ is needed in the future.

2. "/bin/sh: scripts/mod/modpost: No such file or directory"

Copy above files or directory to $kerneldir/build/ fix the errors.

Signed-off-by: Hongzhi.Song <hongzhi.song at windriver.com>
---
 meta/recipes-kernel/linux/kernel-devsrc.bb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/meta/recipes-kernel/linux/kernel-devsrc.bb b/meta/recipes-kernel/linux/kernel-devsrc.bb
index 3900489..feff9f1 100644
--- a/meta/recipes-kernel/linux/kernel-devsrc.bb
+++ b/meta/recipes-kernel/linux/kernel-devsrc.bb
@@ -80,6 +80,12 @@ do_install() {
 
 	cp .config $kerneldir/build
 
+	if [ -d arch/${ARCH}/include ]; then
+	    cp -a --parents arch/${ARCH}/include $kerneldir/build/
+	fi
+
+	cp --parents scripts/mod/modpost $kerneldir/build/
+
 	# This scripts copy blow up QA, so for now, we require a more
 	# complex 'make scripts' to restore these, versus copying them
 	# here. Left as a reference to indicate that we know the scripts must
-- 
2.8.1