1# Copyright (c) 2013 Oracle and/or its affiliates. All Rights Reserved.
2#
3# This program is free software; you can redistribute it and/or
4# modify it under the terms of the GNU General Public License as
5# published by the Free Software Foundation; either version 2 of
6# the License, or (at your option) any later version.
7#
8# This program is distributed in the hope that it would be useful,
9# but WITHOUT ANY WARRANTY; without even the implied warranty of
10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11# GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License
14# along with this program; if not, write the Free Software Foundation,
15# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
16#
17# Author: Alexey Kodanev <alexey.kodanev@oracle.com>
18#
19# Include it to build kernel modules.
20# REQ_VERSION_MAJOR and REQ_VERSION_PATCH must be defined beforehand.
21#
22
23$(if $(REQ_VERSION_MAJOR),,$(error You must define REQ_VERSION_MAJOR))
24$(if $(REQ_VERSION_PATCH),,$(error You must define REQ_VERSION_MINOR))
25
26ifeq ($(WITH_MODULES),no)
27SKIP := 1
28else
29ifeq ($(LINUX_VERSION_MAJOR)$(LINUX_VERSION_PATCH),)
30SKIP := 1
31else
32SKIP ?= $(shell \
33	[ "$(LINUX_VERSION_MAJOR)" -gt "$(REQ_VERSION_MAJOR)" ] || \
34	[ "$(LINUX_VERSION_MAJOR)" -eq "$(REQ_VERSION_MAJOR)" -a \
35	  "$(LINUX_VERSION_PATCH)" -ge "$(REQ_VERSION_PATCH)" ]; echo $$?)
36endif
37endif
38
39ifneq ($(SKIP),0)
40MAKE_TARGETS := $(filter-out %.ko, $(MAKE_TARGETS))
41endif
42
43ifneq ($(filter install clean,$(MAKECMDGOALS)),)
44MAKE_TARGETS := $(filter-out %.ko, $(MAKE_TARGETS))
45MAKE_TARGETS += $(wildcard *.ko)
46endif
47
48CLEAN_TARGETS += .dep_modules
49
50MODULE_SOURCES := $(patsubst %.ko,%.c,$(filter %.ko, $(MAKE_TARGETS)))
51
52# Ignoring the exit status of commands is done to be forward compatible with
53# kernel internal API changes. The user-space test will return TCONF, if it
54# doesn't find the module (i.e. it wasn't built either due to kernel-devel
55# missing or module build failure).
56%.ko: %.c .dep_modules ;
57
58.dep_modules: $(MODULE_SOURCES)
59	@echo "Building modules: $(MODULE_SOURCES)"
60	-$(MAKE) -C $(LINUX_DIR) M=$(abs_srcdir)
61	rm -rf *.mod.c *.o *.ko.unsigned modules.order .tmp* .*.ko .*.cmd Module.symvers
62	@touch .dep_modules
63