From b37d476e197064573206a68ed3bcc2e63257edd8 Mon Sep 17 00:00:00 2001
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 15 Jul 2015 23:49:15 -0400
Subject: [PATCH] Fix: allow LTTng to be built within kernel tree

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
 Makefile                 | 6 ++++--
 Makefile.ABI.workarounds | 2 +-
 lib/Makefile             | 5 +++--
 probes/Makefile          | 5 +++--
 4 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index f233e660..7c878f05 100644
--- a/Makefile
+++ b/Makefile
@@ -5,11 +5,13 @@
 ifneq ($(KERNELRELEASE),)
 ifneq ($(CONFIG_TRACEPOINTS),)
 
-KERNELDIR=${LTTNG_KERNELDIR}
+KERNELDIR = ${LTTNG_KERNELDIR}
+MAKEFILEDIR = $(shell dirname $(lastword $(MAKEFILE_LIST)))
 
 lttng_check_linux_version = $(shell pwd)/include/linux/version.h
 lttng_check_generated_linux_version = $(shell pwd)/include/generated/uapi/linux/version.h
 
+
 #
 # Check for stale version.h, which can be a leftover from an old Linux
 # kernel tree moved to a newer kernel version, only pruned by make
@@ -21,7 +23,7 @@ $(error Duplicate version.h files found in $(lttng_check_linux_version) and $(lt
 endif
 endif
 
-include $(KBUILD_EXTMOD)/Makefile.ABI.workarounds
+include $(MAKEFILEDIR)/Makefile.ABI.workarounds
 
 obj-m += lttng-ring-buffer-client-discard.o
 obj-m += lttng-ring-buffer-client-overwrite.o
diff --git a/Makefile.ABI.workarounds b/Makefile.ABI.workarounds
index f00340c9..be9f1cb5 100644
--- a/Makefile.ABI.workarounds
+++ b/Makefile.ABI.workarounds
@@ -4,7 +4,7 @@
 # the kernel EXTRAVERSION to figure it out. Translate this information
 # into a define visible from the C preprocessor.
 
-DEB_API_VERSION=$(shell $(KBUILD_EXTMOD)/abi-debian-version.sh $(KERNELDIR))
+DEB_API_VERSION=$(shell $(MAKEFILEDIR)/abi-debian-version.sh $(KERNELDIR))
 
 ifneq ($(DEB_API_VERSION), 0)
 ccflags-y += -DDEBIAN_API_VERSION=$(DEB_API_VERSION)
diff --git a/lib/Makefile b/lib/Makefile
index 420c85a5..60744066 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,6 +1,7 @@
-KERNELDIR=${LTTNG_KERNELDIR}
+KERNELDIR = ${LTTNG_KERNELDIR}
+MAKEFILEDIR = $(shell dirname $(lastword $(MAKEFILE_LIST)))
 
-include $(KBUILD_EXTMOD)/Makefile.ABI.workarounds
+include $(MAKEFILEDIR)/../Makefile.ABI.workarounds
 
 obj-m += lttng-lib-ring-buffer.o
 
diff --git a/probes/Makefile b/probes/Makefile
index f0325c87..0314a5e2 100644
--- a/probes/Makefile
+++ b/probes/Makefile
@@ -5,9 +5,10 @@
 ifneq ($(KERNELRELEASE),)
 ifneq ($(CONFIG_TRACEPOINTS),)
 
-KERNELDIR=${LTTNG_KERNELDIR}
+KERNELDIR = ${LTTNG_KERNELDIR}
+MAKEFILEDIR = $(shell dirname $(lastword $(MAKEFILE_LIST)))
 
-include $(KBUILD_EXTMOD)/Makefile.ABI.workarounds
+include $(MAKEFILEDIR)/../Makefile.ABI.workarounds
 
 ccflags-y += -I$(PWD)/probes
 obj-m += lttng-types.o
-- 
2.34.1