drbd: fix compile errors

It fails to build drbd with errors:

|   LD [M] .../tmp/work/qemux86_64-poky-linux/drbd/9.0.17-1-r0/drbd-9.0.17-1/drbd/drbd.o
| x86_64-poky-linux-ld.bfd: cannot find
| .../tmp/work/qemux86_64-poky-linux/drbd/9.0.17-1-r0/drbd-9.0.17-1/drbd/drbd_bitmap.o: No such file or directory

Backport patch from upstream to fix the issue.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-networking/recipes-support/drbd/drbd/0001-drbd-kbuild-fix-use-M-don-t-forget-addprefix-obj.patch

@@ -0,0 +1,79 @@
+Upstream-Status: Backport [https://github.com/LINBIT/drbd-9.0/commit/46e8e3f]
+
+Backport patch to fix compile errors:
+
+|   LD [M]  /home/kkang/buildarea/Yocto/build/tmp/work/qemux86_64-poky-linux/drbd/9.0.17-1-r0/drbd-9.0.17-1/drbd/drbd.o
+| x86_64-poky-linux-ld.bfd: cannot find .../tmp/work/qemux86_64-poky-linux/drbd/9.0.17-1-r0/drbd-9.0.17-1/drbd/drbd_bitmap.o: No such file or directory
+
+Signed-off-by: Kai Kang <kai.kang@windriver.com>
+
+From 46e8e3fc31b651fb56ea38134dcf14382fc43000 Mon Sep 17 00:00:00 2001
+From: Lars Ellenberg <lars.ellenberg@linbit.com>
+Date: Wed, 3 Apr 2019 10:57:46 +0200
+Subject: [PATCH] drbd: kbuild fix: use M=; don't forget addprefix $(obj)
+
+Kernel build started to warn about using SUBDIRS instead of M,
+and we don't support "very old" kernels anymore anyways.
+
+Our list of dependencies for drbd_buildtag.c needs to depend on the
+actual files $(obj)/*.o resulting from the build,
+not on just the list of *.o names.
+
+This apparently also fixes a build failure in opensuse build service for
+tumbleweed when using make-4.2.1-7.5 against kernel 5.0.5-something.
+---
+ drbd/Kbuild   | 11 +++++------
+ drbd/Makefile |  4 +---
+ 2 files changed, 6 insertions(+), 9 deletions(-)
+
+diff --git a/drbd/Kbuild b/drbd/Kbuild
+index 285f7a81..99228029 100644
+--- a/drbd/Kbuild
++++ b/drbd/Kbuild
+@@ -1,4 +1,5 @@
+-obj-m := drbd.o drbd_transport_tcp.o
++obj-m += drbd.o drbd_transport_tcp.o
++# obj-$(CONFIG_BLK_DEV_DRBD)     += drbd.o drbd_transport_tcp.o
+ 
+ clean-files := compat.h $(wildcard .config.$(KERNELVERSION).timestamp)
+ 
+@@ -56,10 +57,8 @@ ifndef DISABLE_KREF_DEBUGGING_HERE
+       drbd-y += kref_debug.o drbd_kref_debug.o
+ endif
+ 
+-$(patsubst %,$(obj)/%,$(drbd-y)): $(obj)/compat.h
+-$(patsubst %,$(obj)/%,drbd_transport_tcp.o): $(obj)/compat.h
+-
+-obj-$(CONFIG_BLK_DEV_DRBD)     += drbd.o
++$(addprefix $(obj)/,$(drbd-y)): $(obj)/compat.h
++$(obj)/drbd_transport_tcp.o: $(obj)/compat.h
+ 
+ # ======================================================================
+ 
+@@ -124,7 +123,7 @@ endif
+ # and not in e.g. dash. I'm too lazy to fix it to be compatible.
+ SHELL=/bin/bash
+ 
+-$(obj)/drbd_buildtag.c: $(filter-out drbd_buildtag.o,$(drbd-y))
++$(obj)/drbd_buildtag.c: $(addprefix $(obj)/,$(filter-out drbd_buildtag.o,$(drbd-y)))
+ 	@$(kecho) '  GEN     $@ $(echo-why)'
+ 	@set -e; exec > $@.new;							\
+ 	echo -e "/* automatically generated. DO NOT EDIT. */";			\
+diff --git a/drbd/Makefile b/drbd/Makefile
+index 5f768fc6..f9e8792a 100644
+--- a/drbd/Makefile
++++ b/drbd/Makefile
+@@ -102,9 +102,7 @@ else
+ 
+   kbuild:
+ 	@rm -f .drbd_kernelrelease*
+-    # previous to 2.6.6 (suse: 2.6.5-dunno), this should be:
+-	$(MAKE) -C $(KDIR)  $(if $(O),O=$(O),) SUBDIRS=$(DRBDSRC) $(ARCH_UM) modules
+-# $(MAKE) -C $(KDIR) M=$(DRBDSRC) $(ARCH_UM) modules
++	$(MAKE) -C $(KDIR)  $(if $(O),O=$(O),) M=$(DRBDSRC) $(ARCH_UM) modules
+ 	-mv .drbd_kernelrelease.new .drbd_kernelrelease
+ 	@echo -n "Memorizing module configuration ... "
+ 	@config=$$( (for x in $(KDIR)/.config $(O)/.config ; do \
+-- 
+2.20.0
+

meta-networking/recipes-support/drbd/drbd_9.0.17-1.bb

@@ -9,7 +9,9 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=5574c6965ae5f583e55880e397fbb018"
 DEPENDS = "virtual/kernel"
 
 SRC_URI = "http://www.linbit.com/downloads/drbd/9.0/drbd-${PV}.tar.gz \
-           file://check_existence_of_modules_before_installing.patch"
+           file://check_existence_of_modules_before_installing.patch \
+           file://0001-drbd-kbuild-fix-use-M-don-t-forget-addprefix-obj.patch \
+           "
 
 SRC_URI[md5sum] = "ae8d5030760b2820a4b3e250447890a0"
 SRC_URI[sha256sum] = "86dd6cc0fdc8123056a3bb67a634cd7ba62a7b05b23caab9995cce7730891da8"