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      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 (a] 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 
     26 ifeq ($(WITH_MODULES),no)
     27 SKIP := 1
     28 else
     29 ifeq ($(LINUX_VERSION_MAJOR)$(LINUX_VERSION_PATCH),)
     30 SKIP := 1
     31 else
     32 SKIP ?= $(shell \
     33 	[ "$(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 $$?)
     36 endif
     37 endif
     38 
     39 ifneq ($(SKIP),0)
     40 MAKE_TARGETS := $(filter-out %.ko, $(MAKE_TARGETS))
     41 endif
     42 
     43 ifneq ($(filter install clean,$(MAKECMDGOALS)),)
     44 MAKE_TARGETS := $(filter-out %.ko, $(MAKE_TARGETS))
     45 MAKE_TARGETS += $(wildcard *.ko)
     46 endif
     47 
     48 CLEAN_TARGETS += .dep_modules
     49 
     50 MODULE_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