1################################################################################ 2# 3# linux-backports 4# 5################################################################################ 6 7LINUX_BACKPORTS_VERSION_MAJOR = 5.8 8LINUX_BACKPORTS_VERSION = $(LINUX_BACKPORTS_VERSION_MAJOR)-1 9LINUX_BACKPORTS_SOURCE = backports-$(LINUX_BACKPORTS_VERSION).tar.xz 10LINUX_BACKPORTS_SITE = $(BR2_KERNEL_MIRROR)/linux/kernel/projects/backports/stable/v$(LINUX_BACKPORTS_VERSION_MAJOR) 11LINUX_BACKPORTS_LICENSE = GPL-2.0 12LINUX_BACKPORTS_LICENSE_FILES = \ 13 COPYING \ 14 LICENSES/exceptions/Linux-syscall-note \ 15 LICENSES/preferred/GPL-2.0 16 17# flex and bison are needed to generate kconfig parser. We use the 18# same logic as the linux kernel (we add host dependencies only if 19# host does not have them). See linux/linux.mk and 20# support/dependencies/check-host-bison-flex.mk. 21LINUX_BACKPORTS_DEPENDENCIES = \ 22 $(BR2_BISON_HOST_DEPENDENCY) \ 23 $(BR2_FLEX_HOST_DEPENDENCY) 24 25ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_DEFCONFIG),y) 26LINUX_BACKPORTS_KCONFIG_FILE = $(LINUX_BACKPORTS_DIR)/defconfigs/$(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG)) 27else ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_CUSTOM_CONFIG),y) 28LINUX_BACKPORTS_KCONFIG_FILE = $(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE)) 29endif 30 31LINUX_BACKPORTS_KCONFIG_FRAGMENT_FILES = $(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CONFIG_FRAGMENT_FILES)) 32LINUX_BACKPORTS_KCONFIG_OPTS = $(LINUX_BACKPORTS_MAKE_OPTS) 33 34# linux-backports' build system expects the config options to be present 35# in the environment, and it is so when using their custom buildsystem, 36# because they are set in the main Makefile, which then calls a second 37# Makefile. 38# 39# In our case, we do not use that first Makefile. So, we parse the 40# .config file, filter-out comment lines and put the rest as command 41# line variables. 42# 43# LINUX_BACKPORTS_MAKE_OPTS is used by the kconfig-package infra, while 44# LINUX_BACKPORTS_MODULE_MAKE_OPTS is used by the kernel-module infra. 45# 46LINUX_BACKPORTS_MAKE_OPTS = \ 47 LEX=flex \ 48 YACC=bison \ 49 BACKPORT_DIR=$(@D) \ 50 KLIB_BUILD=$(LINUX_DIR) \ 51 KLIB=$(TARGET_DIR)/lib/modules/$(LINUX_VERSION_PROBED) \ 52 INSTALL_MOD_DIR=backports \ 53 `sed -r -e '/^\#/d;' $(@D)/.config` 54 55LINUX_BACKPORTS_MODULE_MAKE_OPTS = $(LINUX_BACKPORTS_MAKE_OPTS) 56 57# This file is not automatically generated by 'oldconfig' that we use in 58# the kconfig-package infrastructure. In the linux buildsystem, it is 59# generated by running silentoldconfig, but that's not the case for 60# linux-backports: it uses a hand-crafted rule to generate that file. 61define LINUX_BACKPORTS_KCONFIG_FIXUP_CMDS 62 $(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(LINUX_BACKPORTS_MAKE_OPTS) backport-include/backport/autoconf.h 63endef 64 65# Checks to give errors that the user can understand 66ifeq ($(BR_BUILDING),y) 67 68ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_DEFCONFIG),y) 69ifeq ($(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG)),) 70$(error No linux-backports defconfig name specified, check your BR2_PACKAGE_LINUX_BACKPORTS_DEFCONFIG setting) 71endif 72endif 73 74ifeq ($(BR2_PACKAGE_LINUX_BACKPORTS_USE_CUSTOM_CONFIG),y) 75ifeq ($(call qstrip,$(BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE)),) 76$(error No linux-backports configuration file specified, check your BR2_PACKAGE_LINUX_BACKPORTS_CUSTOM_CONFIG_FILE setting) 77endif 78endif 79 80endif # BR_BUILDING 81 82$(eval $(kernel-module)) 83$(eval $(kconfig-package)) 84 85# linux-backports' own .config file needs options from the kernel's own 86# .config file. The dependencies handling in the infrastructure does not 87# allow to express this kind of dependencies. Besides, linux.mk might 88# not have been parsed yet, so the Linux build dir LINUX_DIR is not yet 89# known. Thus, we use a "secondary expansion" so the rule is re-evaluated 90# after all Makefiles are parsed, and thus at that time we will have the 91# LINUX_DIR variable set to the proper value. Moreover, since linux-4.19, 92# the kernel's build system internally touches its .config file, so we 93# can't use it as a stamp file. We use the LINUX_KCONFIG_STAMP_DOTCONFIG 94# instead. 95# 96# Furthermore, we want to check the kernel version, since linux-backports 97# only supports kernels >= 3.10. To avoid overriding linux-backports' 98# KCONFIG_STAMP_DOTCONFIG rule defined in the kconfig-package infra, we 99# use an intermediate stamp-file. 100# 101# Finally, it must also come after the call to kconfig-package, so we get 102# LINUX_BACKPORTS_DIR properly defined (because the target part of the 103# rule is not re-evaluated). 104# 105$(LINUX_BACKPORTS_DIR)/$(LINUX_BACKPORTS_KCONFIG_STAMP_DOTCONFIG): $(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version 106 107.SECONDEXPANSION: 108$(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version: $$(LINUX_DIR)/$$(LINUX_KCONFIG_STAMP_DOTCONFIG) 109 $(Q)KVER=$(LINUX_VERSION_PROBED); \ 110 KVER_MAJOR=`echo $${KVER} | sed 's/^\([0-9]*\)\..*/\1/'`; \ 111 KVER_MINOR=`echo $${KVER} | sed 's/^[0-9]*\.\([0-9]*\).*/\1/'`; \ 112 if [ $${KVER_MAJOR} -lt 3 -o \( $${KVER_MAJOR} -eq 3 -a $${KVER_MINOR} -lt 10 \) ]; then \ 113 printf "Linux version '%s' is too old for linux-backports (needs 3.10 or later)\n" \ 114 "$${KVER}"; \ 115 exit 1; \ 116 fi 117 $(Q)touch $(@) 118